Human RNA binding proteins

ABSTRACT

The invention provides human RNA binding proteins (RNABP) and polynucleotides which identify and encode RNABP. The invention also provides expression vectors, host cells, antibodies, agonists, and antagonists. The invention also provides methods for diagnosing, treating or preventing disorders associated with expression of RNABP.

[0001] This application is a DIVISIONAL of pending prior application U.S. Ser. No. 09/421,299, filed on Oct. 20, 1999, which in turn is a DIVISIONAL of prior application U.S. Ser. No. 09/176,657, filed on Oct. 21, 1998, now issued as U.S. Pat. No. 6,020,164 on Feb. 1, 2000, both entitled HUMAN RNA BINDING PROTEINS.

FIELD OF THE INVENTION

[0002] This invention relates to nucleic acid and amino acid sequences of human RNA binding proteins and to the use of these sequences in the diagnosis, treatment, and prevention of cancer, immune disorders, and developmental disorders.

BACKGROUND OF THE INVENTION

[0003] The translation of genetic information into protein depends on RNA as a means for storing and decoding DNA polynucleotide sequences. The first step in this process is the transcription of DNA into RNA which is chemically similar to DNA and retains all the genetic information encoded in DNA. The RNA transcript undergoes various processing steps which include splicing and polyadenylation. The mature RNA transcript, called messenger RNA (mRNA), is translated into protein by the ribosomal machinery.

[0004] Nascent RNA transcripts are spliced in the nucleus by the spliceosomal complex which catalyzes the removal of introns and the rejoining of exons. The spliceosomal complex is comprised of five small nuclear ribonucleoprotein particles (snRNPs) designated U1, U2, U4, U5, and U6. Each snRNP contains a single species of RNA and about 10 proteins. The RNA components of some snRNPs recognize and base pair with intron consensus sequences. The protein components mediate spliceosome assembly and the splicing reaction. snRNP proteins and other nuclear RNA binding proteins are generally referred to as RNPs and are characterized by an RNA recognition motif (RRM). (Reviewed in Birney, E. et al. (1993) Nucleic Acids Res. 21:5803-5816.) The RRM is about 80 amino acids in length and forms four β-strands and two a-helices arranged in an α/β sandwich. The RRM contains a core RNP-1 octapeptide motif along with surrounding conserved sequences. In addition to snRNP proteins, examples of RNA-binding proteins which contain the above motifs include heteronuclear ribonucleoproteins which stabilize nascent RNA and factors which regulate alternative splicing. Alternative splicing factors include developmentally regulated proteins which have been identified in lower eukaryotes such as Drosophila melanogaster and Caenorhabditis elegans. These proteins play key roles in developmental processes such as pattern formation and sex determination, respectively. (See, for example, Hodgkin, J. et al. (1994) Development 120:3681-3689.)

[0005] Although most RNPs contain an RRM or RNP-1 motif, there are exceptions. The A′ polypeptide is a unique component of the U2 snRNP that does not contain these motifs (Sillekens, P. T. et al. (1989) Nucleic Acids Res. 17:1893-1906). A′ is 255 amino acids in length with a predicted molecular weight of 28,444 daltons. Notable features of A′ include a leucine-rich amino-terminal half and an extremely hydrophilic carboxy-terminal half. The latter region may be involved in RNA binding, while the former region may mediate protein-protein interactions.

[0006] In addition to splicing, aspects of RNA metabolism include alteration and regulation of RNA conformation and secondary structure. These processes are mediated by RNA helicases which utilize energy derived from ATP hydrolysis to destabilize and unwind RNA duplexes. The most well-characterized and ubiquitous family of RNA helicases is the DEAD-box family, so named for the conserved B-type ATP-binding motif which is diagnostic of proteins in this family. Over 40 DEAD-box helicases have been identified in organisms as diverse as bacteria, insects, yeast, amphibians, mammals, and plants. For example, a recent addition to the DEAD-box family is the RNA helicase encoded by the Drosophila hlc gene (Maleszka, R. et al. (1998) Proc. Natl. Acad. Sci. USA 95:3731-3736). DEAD-box helicases function in diverse processes such as translation initiation, splicing, ribosome assembly, and RNA editing, transport, and stability. Some DEAD-box helicases play tissue- and stage-specific roles in spermatogenesis and embryogenesis. All DEAD-box helicases contain several conserved sequence motifs spread out over about 420 amino acids. These motifs include an A-type ATP binding motif, the DEAD-box/B-type ATP-binding motif, a serine/arginine/threonine tripeptide of unknown function, and a C-terminal glycine-rich motif with a possible role in substrate binding and unwinding. In addition, alignment of divergent DEAD-box helicase sequences has shown that 37 amino acid residues are identical among these sequences, suggesting that conservation of these residues is important for helicase function. (Reviewed in Linder, P. et al. (1989) Nature 337:121-122.)

[0007] Overexpression of the DEAD-box I protein (DDX1) may play a role in the progression of neuroblastoma (Nb) and retinoblastoma (Rb) tumors (Godbout, R. et al. (1998) J. Biol. Chem. 273:21161-21168). Nb and Rb tumor progression is promoted by the amplification of the proto-oncogene encoding MYCN, a transcription factor. However, amplification of both the MYCN gene and the DDX1 gene, which maps in proximity to the MYCN gene on chromosome 2, is correlated with significantly higher rates of tumor progression. Amplification of the DDX1 gene results in increased levels of DDX1 RNA and protein, the latter being aberrantly localized in Nb and Rb cells. These observations suggest that DDX1 may promote or enhance tumor progression by altering the normal secondary structure and expression levels of RNA in cancer cells. In addition, cancer cells that have amplified both DDX1 and MYCN genes may have a selective advantage over cancer cells that have amplified only the MYCN gene.

[0008] Other DEAD-box helicases have been implicated either directly or indirectly in tumorigenesis. (Discussed in Godbout, supra.) For example, murine p68 is mutated in ultraviolet light-induced tumors, and human DDX6 is located at a chromosomal breakpoint associated with B-cell lymphoma. Similarly, a chimeric protein comprised of DDX10 and NUP98, a nucleoporin protein, may be involved in the pathogenesis of certain myeloid malignancies.

[0009] The discovery of new human RNA binding proteins and the polynucleotides encoding them satisfies a need in the art by providing new compositions which are useful in the diagnosis, prevention, and treatment of cancer, immune disorders, and developmental disorders.

SUMMARY OF THE INVENTION

[0010] The invention features substantially purified polypeptides, human RNA binding proteins, referred to collectively as RNABP and individually as “RNABP-1,” “RNABP-2,” and “RNABP-3.” In one aspect, the invention provides a substantially purified polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3 (SEQ ID NO:1-3), and fragments thereof.

[0011] The invention further provides a substantially purified variant having at least 90% amino acid identity to at least one of the amino acid sequences selected from the group consisting of SEQ ID NO:1-3 and fragments thereof. The invention also provides an isolated and purified polynucleotide encoding the polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3 and fragments thereof. The invention also includes an isolated and purified polynucleotide variant having at least 70% polynucleotide sequence identity to the polynucleotide encoding the polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3 and fragments thereof.

[0012] Additionally, the invention provides an isolated and purified polynucleotide which hybridizes under stringent conditions to the polynucleotide encoding the polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3 and fragments thereof. The invention also provides an isolated and purified polynucleotide having a sequence which is complementary to the polynucleotide encoding the polypeptide comprising the amino acid sequence selected from the group consisting of SEQ ID NO:1-3 and fragments thereof.

[0013] The invention also provides an isolated and purified polynucleotide comprising a polynucleotide sequence selected from the group consisting of SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6 (SEQ ID NO:4-6), and fragments thereof. The invention further provides an isolated and purified polynucleotide variant having at least 70% polynucleotide sequence identity to the polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6 and fragments thereof. The invention also provides an isolated and purified polynucleotide having a sequence which is complementary to the polynucleotide comprising a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6 and fragments thereof.

[0014] The invention also provides a method for detecting a polynucleotide in a sample containing nucleic acids, the method comprising the steps of (a) hybridizing the complement of the polynucleotide sequence to at least one of the polynucleotides of the sample, thereby forming a hybridization complex; and (b) detecting the hybridization complex, wherein the presence of the hybridization complex correlates with the presence of a polynucleotide in the sample. In one aspect, the method further comprises amplifying the polynucleotide prior to hybridization.

[0015] The invention further provides an expression vector containing at least a fragment of the polynucleotide encoding the polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3 and fragments thereof. In another aspect, the expression vector is contained within a host cell.

[0016] The invention also provides a method for producing a polypeptide, the method comprising the steps of: (a) culturing the host cell containing an expression vector containing at least a fragment of a polynucleotide under conditions suitable for the expression of the polypeptide; and (b) recovering the polypeptide from the host cell culture.

[0017] The invention also provides a pharmaceutical composition comprising a substantially purified polypeptide having the amino acid sequence selected from the group consisting of SEQ ID NO:1-3 and fragments thereof, in conjunction with a suitable pharmaceutical carrier.

[0018] The invention further includes a purified antibody which binds to a polypeptide selected from the group consisting of SEQ ID NO:1-3 and fragments thereof. The invention also provides a purified agonist and a purified antagonist to the polypeptide.

[0019] The invention also provides a method for treating or preventing a disorder associated with decreased expression or activity of RNABP, the method comprising administering to a subject in need of such treatment an effective amount of a pharmaceutical composition comprising a substantially purified polypeptide having the amino acid sequence selected from the group consisting of SEQ ID NO:1-3 and fragments thereof, in conjunction with a suitable pharmaceutical carrier.

[0020] The invention also provides a method for treating or preventing a disorder associated with increased expression or activity of RNABP, the method comprising administering to a subject in need of such treatment an effective amount of an antagonist of a polypeptide having an amino acid sequence selected from the group consisting of SEQ ID NO:1-3 and fragments thereof.

BRIEF DESCRIPTION OF THE FIGURES AND TABLE

[0021]FIGS. 1A, 1B, and 1C show the amino acid sequence alignment between RNABP-1 (1229372; SEQ ID NO:1) and hlc-encoded RNA helicase (GI 3378056; SEQ ID NO:7). The alignment was produced using the multisequence alignment program of LASERGENE software (DNASTAR, Madison Wis.).

[0022]FIG. 2 shows the amino acid sequence alignment between amino acids 110 to 198 of RNABP-2 (1250374; SEQ ID NO:2) and amino acids 152 to 238 of sex determination-associated RNP (GI 608464; SEQ ID NO:8).

[0023]FIGS. 3A and 3B show the amino acid sequence alignment between RNABP-3 (1710966; SEQ ID NO:3) and U2 snRNP A′ (61 37547; SEQ ID. NO:9).

[0024] Table 1 shows the programs, their descriptions, references, and threshold parameters used to analyze RNABP.

DESCRIPTION OF THE INVENTION

[0025] Before the present proteins, nucleotide sequences, and methods are described, it is understood that this invention is not limited to the particular machines, materials and methods described, as these may vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention which will be limited only by the appended claims.

[0026] It must be noted that as used herein and in the appended claims, the singular forms “a,” “an,” and “the” include plural reference unless the context clearly dictates otherwise. Thus, for example, a reference to “a host cell” includes a plurality of such host cells, and a reference to “an antibody” is a reference to one or more antibodies and equivalents thereof known to those skilled in the art, and so forth.

[0027] Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any machines, materials, and methods similar or equivalent to those described herein can be used to practice or test the present invention, the preferred machines, materials and methods are now described. All publications mentioned herein are cited for the purpose of describing and disclosing the cell lines, protocols, reagents and vectors which are reported in the publications and which might be used in connection with the invention. Nothing herein is to be construed as an admission that the invention is not entitled to antedate such disclosure by virtue of prior invention.

[0028] Definitions

[0029] “RNABP” refers to the amino acid sequences of substantially purified RNABP obtained from any species, particularly a mammalian species, including bovine, ovine, porcine, murine, equine, and preferably the human species, from any source, whether natural, synthetic, semi-synthetic, or recombinant.

[0030] The term “agonist” refers to a molecule which, when bound to RNABP, increases or prolongs the duration of the effect of RNABP. Agonists may include proteins, nucleic acids, carbohydrates, or any other molecules which bind to and modulate the effect of RNABP.

[0031] An “allelic variant” is an alternative form of the gene encoding RNABP. Allelic variants may result from at least one mutation in the nucleic acid sequence and may result in altered mRNAs or in polypeptides whose structure or function may or may not be altered. Any given natural or recombinant gene may have none, one, or many allelic forms. Common mutational changes which give rise to allelic variants are generally ascribed to natural deletions, additions, or substitutions of nucleotides. Each of these types of changes may occur alone, or in combination with the others, one or more times in a given sequence.

[0032] “Altered” nucleic acid sequences encoding RNABP include those sequences with deletions, insertions, or substitutions of different nucleotides, resulting in a polynucleotide the same as RNABP or a polypeptide with at least one functional characteristic of RNABP. Included within this definition are polymorphisms which may or may not be readily detectable using a particular oligonucleotide probe of the polynucleotide encoding RNABP, and improper or unexpected hybridization to allelic variants, with a locus other than the normal chromosomal locus for the polynucleotide sequence encoding RNABP. The encoded protein may also be “altered,” and may contain deletions, insertions, or substitutions of amino acid residues which produce a silent change and result in a functionally equivalent RNABP. Deliberate amino acid substitutions may be made on the basis of similarity in polarity, charge, solubility, hydrophobicity, hydrophilicity, and/or the amphipathic nature of the residues, as long as the biological or immunological activity of RNABP is retained. For example, negatively charged amino acids may include aspartic acid and glutamic acid, positively charged amino acids may include lysine and arginine, and amino acids with uncharged polar head groups having similar hydrophilicity values may include leucine, isoleucine, and valine; glycine and alanine; asparagine and glutamine; serine and threonine; and phenylalanine and tyrosine.

[0033] The terms “amino acid” or “amino acid sequence” refer to an oligopeptide, peptide, polypeptide, or protein sequence, or a fragment of any of these, and to naturally occurring or synthetic molecules. In this context, “fragments,” “immunogenic fragments,” or “antigenic fragments” refer to fragments of RNABP which are preferably at least 5 to about 15 amino acids in length, most preferably at least 14 amino acids, and which retain some biological activity or immunological activity of RNABP. Where “amino acid sequence” is recited to refer to an amino acid sequence of a naturally occurring protein molecule, “amino acid sequence” and like terms are not meant to limit the amino acid sequence to the complete native amino acid sequence associated with the recited protein molecule.

[0034] “Amplification” relates to the production of additional copies of a nucleic acid sequence. Amplification is generally carried out using polymerase chain reaction (PCR) technologies well known in the art.

[0035] The term “antagonist” refers to a molecule which, when bound to RNABP, decreases the amount or the duration of the effect of the biological or immunological activity of RNABP. Antagonists may include proteins, nucleic acids, carbohydrates, antibodies, or any other molecules which decrease the effect of RNABP.

[0036] The term “antibody” refers to intact molecules as well as to fragments thereof, such as Fab, F(ab′)₂, and Fv fragments, which are capable of binding the epitopic determinant. Antibodies that bind RNABP polypeptides can be prepared using intact polypeptides or using fragments containing small peptides of interest as the immunizing antigen. The polypeptide or oligopeptide used to immunize an animal (e.g., a mouse, a rat, or a rabbit) can be derived from the translation of RNA, or synthesized chemically, and can be conjugated to a carrier protein if desired. Commonly used carriers that are chemically coupled to peptides include bovine serum albumin, thyroglobulin, and keyhole limpet hemocyanin (KLH). The coupled peptide is then used to immunize the animal.

[0037] The term “antigenic determinant” refers to that fragment of a molecule (i.e., an epitope) that makes contact with a particular antibody. When a protein or a fragment of a protein is used to immunize a host animal, numerous regions of the protein may induce the production of antibodies which bind specifically to antigenic determinants (given regions or three-dimensional structures on the protein). An antigenic determinant may compete with the intact antigen (i.e., the immunogen used to elicit the immune response) for binding to an antibody.

[0038] The term “antisense” refers to any composition containing a nucleic acid sequence which is complementary to the “sense” strand of a specific nucleic acid sequence. Antisense molecules may be produced by any method including synthesis or transcription. Once introduced into a cell, the complementary nucleotides combine with natural sequences produced by the cell to form duplexes and to block either transcription or translation. The designation “negative” can refer to the antisense strand, and the designation “positive” can refer to the sense strand.

[0039] The term “biologically active,” refers to a protein having structural, regulatory, or biochemical functions of a naturally occurring molecule. Likewise, “immunologically active” refers to the capability of the natural, recombinant, or synthetic RNABP, or of any oligopeptide thereof, to induce a specific immune response in appropriate animals or cells and to bind with specific antibodies.

[0040] The terms “complementary” or “complementarity” refer to the natural binding of polynucleotides by base pairing. For example, the sequence “5′ A-G-T 3′” bonds to the complementary sequence “3′ T-C-A 5′.” Complementarity between two single-stranded molecules may be “partial,” such that only some of the nucleic acids bind, or it may be “complete,” such that total complementarity exists between the single stranded molecules. The degree of complementarity between nucleic acid strands has significant effects on the efficiency and strength of the hybridization between the nucleic acid strands. This is of particular importance in amplification reactions, which depend upon binding between nucleic acids strands, and in the design and use of peptide nucleic acid (PNA) molecules.

[0041] A “composition comprising a given polynucleotide sequence” or a “composition comprising a given amino acid sequence” refer broadly to any composition containing the given polynucleotide or amino acid sequence. The composition may comprise a dry formulation or an aqueous solution. Compositions comprising polynucleotide sequences encoding RNABP or fragments of RNABP may be employed as hybridization probes. The probes may be stored in freeze-dried form and may be associated with a stabilizing agent such as a carbohydrate. In hybridizations, the probe may be deployed in an aqueous solution containing salts (e.g., NaCl), detergents (e.g., sodium dodecyl sulfate; SDS), and other components (e.g., Denhardt's solution, dry milk, salmon sperm DNA, etc.). “Consensus sequence” refers to a nucleic acid sequence which has been resequenced to resolve uncalled bases, extended using an XL-PCR kit (Perkin-Elmer, Norwalk Conn.) in the 5′ and/or the 3′ direction, and resequenced, or which has been assembled from the overlapping sequences of more than one Incyte Clone using a computer program for fragment assembly, such as the GELVIEW fragment assembly system (GCG, Madison Wis.). Some sequences have been both extended and assembled to produce the consensus sequence.

[0042] The term “correlates with expression of a polynucleotide” indicates that the detection of the presence of nucleic acids, the same or related to a nucleic acid sequence encoding RNABP, by northern analysis is indicative of the presence of nucleic acids encoding RNABP in a sample, and thereby correlates with expression of the transcript from the polynucleotide encoding RNABP.

[0043] A “deletion” refers to a change in the amino acid or nucleotide sequence that results in the absence of one or more amino acid residues or nucleotides.

[0044] The term “derivative” refers to the chemical modification of a polypeptide sequence, or a polynucleotide sequence. Chemical modifications of a polynucleotide sequence can include, for example, replacement of hydrogen by an alkyl, acyl, or amino group. A derivative polynucleotide encodes a polypeptide which retains at least one biological or immunological function of the natural molecule. A derivative polypeptide is one modified by glycosylation, pegylation, or any similar process that retains at least one biological or immunological function of the polypeptide from which it was derived.

[0045] The term “similarity” refers to a degree of complementarity. There may be partial similarity or complete similarity. The word “identity” may substitute for the word “similarity.” A partially complementary sequence that at least partially inhibits an identical sequence from hybridizing to a target nucleic acid is referred to as “substantially similar.” The inhibition of hybridization of the completely complementary sequence to the target sequence may be examined using a hybridization assay (Southern or northern blot, solution hybridization, and the like) under conditions of reduced stringency. A substantially similar sequence or hybridization probe will compete for and inhibit the binding of a completely similar (identical) sequence to the target sequence under conditions of reduced stringency. This is not to say that conditions of reduced stringency are such that non-specific binding is permitted, as reduced stringency conditions require that the binding of two sequences to one another be a specific (i.e., a selective) interaction. The absence of non-specific binding may be tested by the use of a second target sequence which lacks even a partial degree of complementarity (e.g., less than about 30% similarity or identity). In the absence of non-specific binding, the substantially similar sequence or probe will not hybridize to the second non-complementary target sequence.

[0046] The phrases “percent identity” or “% identity” refer to the percentage of sequence similarity found in a comparison of two or more amino acid or nucleic acid sequences. Percent identity can be determined electronically, e.g., by using the MEGALIGN program (DNASTAR, Madison Wis.) which creates alignments between two or more sequences according to methods selected by the user, e.g., the clustal method. (See, e.g., Higgins, D. G. and P. M. Sharp (1988) Gene 73:237-244.) The clustal algorithm groups sequences into clusters by examining the distances between all pairs. The clusters are aligned pairwise and then in groups. The percentage similarity between two amino acid sequences, e.g., sequence A and sequence B, is calculated by dividing the length of sequence A, minus the number of gap residues in sequence A, minus the number of gap residues in sequence B, into the sum of the residue matches between sequence A and sequence B, times one hundred. Gaps of low or of no similarity between the two amino acid sequences are not included in determining percentage similarity. Percent identity between nucleic acid sequences can also be counted or calculated by other methods known in the art, e.g., the Jotun Hein method. (See, e.g., Hein, J. (1990) Methods Enzymol. 183:626-645.) Identity between sequences can also be determined by other methods known in the art, e.g., by varying hybridization conditions.

[0047] “Human artificial chromosomes” (HACs) are linear microchromosomes which may contain DNA sequences of about 6 kb to 10 Mb in size, and which contain all of the elements required for stable mitotic chromosome segregation and maintenance.

[0048] The term “humanized antibody” refers to antibody molecules in which the amino acid sequence in the non-antigen binding regions has been altered so that the antibody more closely resembles a human antibody, and still retains its original binding ability.

[0049] “Hybridization” refers to any process by which a strand of nucleic acid binds with a complementary strand through base pairing.

[0050] The term “hybridization complex” refers to a complex formed between two nucleic acid sequences by virtue of the formation of hydrogen bonds between complementary bases. A hybridization complex may be formed in solution (e.g., Cot or Rot analysis) or formed between one nucleic acid sequence present in solution and another nucleic acid sequence immobilized on a solid support (e.g., paper, membranes, filters, chips, pins or glass slides, or any other appropriate substrate to which cells or their nucleic acids have been fixed).

[0051] The words “insertion” or “addition” refer to changes in an amino acid or nucleotide sequence resulting in the addition of one or more amino acid residues or nucleotides, respectively, to the sequence found in the naturally occurring molecule.

[0052] “Immune response” can refer to conditions associated with inflammation, trauma, immune disorders, or infectious or genetic disease, etc. These conditions can be characterized by expression of various factors, e.g., cytokines, chemokines, and other signaling molecules, which may affect cellular and systemic defense systems.

[0053] The term “microarray” refers to an arrangement of distinct polynucleotides on a substrate.

[0054] The terms “element” or “array element” in a microarray context, refer to hybridizable polynucleotides arranged on the surface of a substrate.

[0055] The term “modulate” refers to a change in the activity of RNABP. For example, modulation may cause an increase or a decrease in protein activity, binding characteristics, or any other biological, functional, or immunological properties of RNABP.

[0056] The phrases “nucleic acid” or “nucleic acid sequence” refer to a nucleotide, oligonucleotide, polynucleotide, or any fragment thereof. These phrases also refer to DNA or RNA of genomic or synthetic origin which may be single-stranded or double-stranded and may represent the sense or the antisense strand, to peptide nucleic acid (PNA), or to any DNA-like or RNA-like material. In this context, “fragments” refers to those nucleic acid sequences which, when translated, would produce polypeptides retaining some functional characteristic, e.g., antigenicity, or structural domain characteristic, e.g., ATP-binding site, of the full-length polypeptide.

[0057] The terms “operably associated” or “operably linked” refer to functionally related nucleic acid sequences. A promoter is operably associated or operably linked with a coding sequence if the promoter controls the translation of the encoded polypeptide. While operably associated or operably linked nucleic acid sequences can be contiguous and in the same reading frame, certain genetic elements, e.g., repressor genes, are not contiguously linked to the sequence encoding the polypeptide but still bind to operator sequences that control expression of the polypeptide.

[0058] The term “oligonucleotide” refers to a nucleic acid sequence of at least about 6 nucleotides to 60 nucleotides, preferably about 15 to 30 nucleotides, and most preferably about 20 to 25 nucleotides, which can be used in PCR amplification or in a hybridization assay or microarray. “Oligonucleotide” is substantially equivalent to the terms “amplimer,” “primer,” “oligomer,” and “probe,” as these terms are commonly defined in the art. “Peptide nucleic acid” (PNA) refers to an antisense molecule or anti-gene agent which comprises an oligonucleotide of at least about 5 nucleotides in length linked to a peptide backbone of amino acid residues ending in lysine. The terminal lysine confers solubility to the composition. PNAs preferentially bind complementary single stranded DNA or RNA and stop transcript elongation, and may be pegylated to extend their lifespan in the cell.

[0059] The term “sample” is used in its broadest sense. A sample suspected of containing nucleic acids encoding RNABP, or fragments thereof, or RNABP itself, may comprise a bodily fluid; an extract from a cell, chromosome, organelle, or membrane isolated from a cell; a cell; genomic DNA, RNA, or cDNA, in solution or bound to a substrate; a tissue; a tissue print; etc.

[0060] The terms “specific binding” or “specifically binding” refer to that interaction between a protein or peptide and an agonist, an antibody, or an antagonist. The interaction is dependent upon the presence of a particular structure of the protein, e.g., the antigenic determinant or epitope, recognized by the binding molecule. For example, if an antibody is specific for epitope “A,” the presence of a polypeptide containing the epitope A, or the presence of free unlabeled A, in a reaction containing free labeled A and the antibody will reduce the amount of labeled A that binds to the antibody.

[0061] The term “stringent conditions” refers to conditions which permit hybridization between polynucleotides and the claimed polynucleotides. Stringent conditions can be defined by salt concentration, the concentration of organic solvent, e.g., formamide, temperature, and other conditions well known in the art. In particular, stringency can be increased by reducing the concentration of salt, increasing the concentration of formamide, or raising the hybridization temperature.

[0062] The term “substantially purified” refers to nucleic acid or amino acid sequences that are removed from their natural environment and are isolated or separated, and are at least about 60% free, preferably about 75% free, and most preferably about 90% free from other components with which they are naturally associated.

[0063] A “substitution” refers to the replacement of one or more amino acids or nucleotides by different amino acids or nucleotides, respectively.

[0064] “Substrate” refers to any suitable rigid or semi-rigid support including membranes, filters, chips, slides, wafers, fibers, magnetic or nonmagnetic beads, gels, tubing, plates, polymers, microparticles and capillaries. The substrate can have a variety of surface forms, such as wells, trenches, pins, channels and pores, to which polynucleotides or polypeptides are bound.

[0065] “Transformation” describes a process by which exogenous DNA enters and changes a recipient cell. Transformation may occur under natural or artificial conditions according to various methods well known in the art, and may rely on any known method for the insertion of foreign nucleic acid sequences into a prokaryotic or eukaryotic host cell. The method for transformation is selected based on the type of host cell being transformed and may include, but is not limited to, viral infection, electroporation, heat shock, lipofection, and particle bombardment. The term “transformed” cells includes stably transformed cells in which the inserted DNA is capable of replication either as an autonomously replicating plasmid or as part of the host chromosome, as well as transiently transformed cells which express the inserted DNA or RNA for limited periods of time.

[0066] A “variant” of RNABP polypeptides refers to an amino acid sequence that is altered by one or more amino acid residues. The variant may have “conservative” changes, wherein a substituted amino acid has similar structural or chemical properties (e.g., replacement of leucine with isoleucine). More rarely, a variant may have “nonconservative” changes (e.g., replacement of glycine with tryptophan). Analogous minor variations may also include amino acid deletions or insertions, or both. Guidance in determining which amino acid residues may be substituted, inserted, or deleted without abolishing biological or immunological activity may be found using computer programs well known in the art, for example, LASERGENE software (DNASTAR).

[0067] The term “variant,” when used in the context of a polynucleotide sequence, may encompass a polynucleotide sequence related to RNABP. This definition may also include, for example, “allelic” (as defined above), “splice,” “species,” or “polymorphic” variants. A splice variant may have significant identity to a reference molecule, but will generally have a greater or lesser number of polynucleotides due to alternate splicing of exons during mRNA processing. The corresponding polypeptide may possess additional functional domains or an absence of domains. Species variants are polynucleotide sequences that vary from one species to another. The resulting polypeptides generally will have significant amino acid identity relative to each other. A polymorphic variant is a variation in the polynucleotide sequence of a particular gene between individuals of a given species. Polymorphic variants also may encompass “single nucleotide polymorphisms” (SNPs) in which the polynucleotide sequence varies by one base. The presence of SNPs may be indicative of, for example, a certain population, a disease state, or a propensity for a disease state.

[0068] The Invention

[0069] The invention is based on the discovery of new human RNA binding proteins (RNABP), the polynucleotides encoding RNABP, and the use of these compositions for the diagnosis, treatment, or prevention of cancer, immune disorders, and developmental disorders.

[0070] Nucleic acids encoding the RNABP-1 of the present invention were identified in Incyte Clone 1229372H1 from the brain tumor cDNA library (BRAITUT01) using a computer search for nucleotide and/or amino acid sequence alignments. A consensus sequence, SEQ ID NO:4, was derived from the following overlapping and/or extended nucleic acid sequences: Incyte Clones 1229372H1, 1229372R6, 746935R1, and 746935F1 (BRAITUT01), 2556653H1 (THYMNOT03), 5191358H1 (OVARDIT06), 4982390H1 (HELATXT05), 995084R6 (KIDNTUT01), and 2062042R6 (OVARNOT03).

[0071] In one embodiment, the invention encompasses a polypeptide comprising the amino acid sequence of SEQ ID NO:1. RNABP-1 is 547 amino acids in length and has one potential N-glycosylation site at N117; two potential cAMP- and cGMP-dependent protein kinase phosphorylation sites at T75 and S515; six potential casein kinase II phosphorylation sites at S119, T199, T240, T315, S339, and T462; and ten potential protein kinase C phosphorylation sites at S55, S126, S153, T217, S271, T376, S457, S517, S532, and T543. PFAM analysis indicates that the regions of RNABP-1 from G13 to K253 and from Y272 to N380 are similar to protein domains found in members of the DEAD-box family of ATP-dependent helicases. Within these regions, BLOCKS, MOTIFS, and PROFILESCAN identify several sequence signatures that are characteristic of DEAD-box family members. These signatures include an A-type ATP binding site from A51 to T58, a DEAD-box motif from L163 to F176, and a putative substrate-binding/unwinding domain from G344 to F388. Amino acids surrounding these signatures are also highly conserved among RNABP-1 and DEAD-box family members. In addition, 32 out of the 37 functionally significant amino acids identified by Linder et al. (supra) are conserved in RNABP-1, including the serine/arginine/threonine tripeptide. As shown in FIGS. 1A, 1B, and 1C, RNABP-1 has chemical and structural similarity with hlc-encoded RNA helicase (GI 3378056; SEQ ID NO:7). In particular, RNABP-1 and hlc-encoded RNA helicase share 44% identity. Fragments of SEQ ID NO:4 from about nucleotide 404 to about nucleotide 433 and from about nucleotide 1412 to about nucleotide 1441 are useful in hybridization or amplification technologies to identify SEQ ID NO:4 and to distinguish between SEQ ID NO:4 and a related sequence. Northern analysis shows the expression of this sequence in various libraries, at least 62% of which are associated with cancerous or proliferating tissue and at least 32% of which are associated with the immune response or trauma. In particular, 22% of the libraries expressing RNABP-1 are derived from reproductive tissue, 18% are derived from gastrointestinal tissue, and 18% are derived from neural tissue. For example, some of the libraries expressing RNABP-1 are derived from white blood cells, fetal intestine, and brain and prostate tumor tissue.

[0072] Nucleic acids encoding the RNABP-2 of the present invention were identified in Incyte Clone 1250374H1 from the fetal lung cDNA library (LUNGFET03) using a computer search for nucleotide and/or amino acid sequence alignments. A consensus sequence, SEQ ID NO:5, was derived from the following overlapping and/or extended nucleic acid sequences: Incyte Clones 1250374H1 and 1250374T6 (LUNGFET03), 1573760T6 (LNODNOT03), 960131R6 (BRSTTUT03), and 2743653H1 (BRSTTUT14).

[0073] In one embodiment, the invention encompasses a polypeptide comprising the amino acid sequence of SEQ ID NO:2. RNABP-2 is 366 amino acids in length and has three potential N-glycosylation sites at N58, N80, and N184; two potential casein kinase II phosphorylation sites at T16 and T173; and four potential protein kinase C phosphorylation sites at T109, T186, T191, and S238. PFAM analysis indicates that the region of RNABP-2 from L113 to V182 is similar to the RRM domain. Within this region, MOTIFS, BLOCKS, and PROFILESCAN identify an RNP-1 signature from K150 to F157 along with surrounding conserved amino acid sequences. RNABP-2 has chemical and structural similarity with sex-determination associated RNP (GI 608464; SEQ ID NO:8). As shown in FIG. 2, the region of RNABP-2 from P110 to P198 shares 72% identity with the region of sex-determination-associated RNP from P152 to P238. A fragment of SEQ ID NO:5 from about nucleotide 198 to about nucleotide 227 is useful in hybridization or amplification technologies to identify SEQ ID NO:5 and to distinguish between SEQ ID NO:5 and a related sequence. Northern analysis shows the expression of this sequence in various libraries, at least 63% of which are associated with cancerous or proliferating tissue and at least 35% of which are associated with the immune response or trauma. In particular, 25% of the libraries expressing RNABP-2 are derived from reproductive tissue and 20% are derived from neural tissue. For example, some of the libraries expressing RNABP-2 are derived from breast tumor, fetal brain, and synovial tissue.

[0074] Nucleic acids encoding the RNABP-3 of the present invention were identified in Incyte Clone 1710966H1 from the prostate cDNA library (PROSNOT16) using a computer search for nucleotide and/or amino acid sequence alignments. A consensus sequence, SEQ ID NO:6, was derived from the following overlapping and/or extended nucleic acid sequences: Incyte Clones 1710966H1 and 1710966F6 (PROSNOT16) and 1298650F6 (BRSTNOT07).

[0075] In one embodiment, the invention encompasses a polypeptide comprising the amino acid sequence of SEQ ID NO:3. RNABP-3 is 226 amino acids in length and has five potential casein kinase II phosphorylation sites at S54, T88, T152, S174, and S180 and one potential tyrosine kinase phosphorylation site at Y132. PRINTS analysis indicates the presence of multiple leucine-rich repeats within the region from G30 to R153. As shown in FIGS. 3A and 3B, RNABP-3 has chemical and structural similarity with U2 snRNP A′ (GI 37547; SEQ ID NO:9). In particular, RNABP-3 and U2 snRNP A′ share 19% identity. RNABP-3 and U2 snRNP A′ are similar in length with 226 and 255 amino acids, respectively. In addition, hydropathy plots indicate that the carboxy-terminal half of RNABP-3, like that of U2 snRNP A′, is hydrophilic. Likewise, the N-terminal half of RNABP-3 is leucine-rich as discussed above. A fragment of SEQ ID NO:6 from about nucleotide 64 to about nucleotide 93 is useful in hybridization or amplification technologies to identify SEQ ID NO:6 and to distinguish between SEQ ID NO:6 and a related sequence. Northern analysis shows the expression of this sequence in various libraries, at least 63% of which are associated with cancerous or proliferating tissue and at least 21% of which are associated with the immune response or trauma. In particular, 26% of the libraries expressing RNABP-3 are derived from reproductive tissue and 21% are derived from cardiovascular tissue. For example, some of the libraries expressing RNABP-3 are derived from lung tumor, breast tumor, and heart atrium tissue.

[0076] The invention also encompasses RNABP variants. A preferred RNABP variant is one which has at least about 80%, more preferably at least about 90%, and most preferably at least about 95% amino acid sequence identity to the RNABP amino acid sequence, and which contains at least one functional or structural characteristic of RNABP.

[0077] The invention also encompasses polynucleotides which encode RNABP. In a particular embodiment, the invention encompasses a polynucleotide sequence comprising a sequence selected from the group consisting of SEQ ID NO:4-6, which encodes RNABP.

[0078] The invention also encompasses a variant of a polynucleotide sequence encoding RNABP. In particular, such a variant polynucleotide sequence will have at least about 70%, more preferably at least about 85%, and most preferably at least about 95% polynucleotide sequence identity to the polynucleotide sequence encoding RNABP. A particular aspect of the invention encompasses a variant of a polynucleotide sequence comprising a sequence selected from the group consisting of SEQ ID NO:4-6 which has at least about 70%, more preferably at least about 85%, and most preferably at least about 95% polynucleotide sequence identity to a nucleic acid sequence selected from the group consisting of SEQ ID NO:4-6. Any one of the polynucleotide variants described above can encode an amino acid sequence which contains at least one functional or structural characteristic of RNABP.

[0079] It will be appreciated by those skilled in the art that as a result of the degeneracy of the genetic code, a multitude of polynucleotide sequences encoding RNABP, some bearing minimal similarity to the polynucleotide sequences of any known and naturally occurring gene, may be produced. Thus, the invention contemplates each and every possible variation of polynucleotide sequence that could be made by selecting combinations based on possible codon choices. These combinations are made in accordance with the standard triplet genetic code as applied to the polynucleotide sequence of naturally occurring RNABP, and all such variations are to be considered as being specifically disclosed.

[0080] Although nucleotide sequences which encode RNABP and its variants are preferably capable of hybridizing to the nucleotide sequence of the naturally occurring RNABP under appropriately selected conditions of stringency, it may be advantageous to produce nucleotide sequences encoding RNABP or its derivatives possessing a substantially different codon usage, e.g., inclusion of non-naturally occurring codons. Codons may be selected to increase the rate at which expression of the peptide occurs in a particular prokaryotic or eukaryotic host in accordance with the frequency with which particular codons are utilized by the host. Other reasons for substantially altering the nucleotide sequence encoding RNABP and its derivatives without altering the encoded amino acid sequences include the production of RNA transcripts having more desirable properties, such as a greater half-life, than transcripts produced from the naturally occurring sequence.

[0081] The invention also encompasses production of DNA sequences which encode RNABP and RNABP derivatives, or fragments thereof, entirely by synthetic chemistry. After production, the synthetic sequence may be inserted into any of the many available expression vectors and cell systems using reagents well known in the art. Moreover, synthetic chemistry may be used to introduce mutations into a sequence encoding RNABP or any fragment thereof.

[0082] Also encompassed by the invention are polynucleotide sequences that are capable of hybridizing to the claimed polynucleotide sequences, and, in particular, to those shown in SEQ ID NO:4-6 and fragments thereof under various conditions of stringency. (See, e.g., Wahl, G. M. and S. L. Berger (1987) Methods Enzymol. 152:399-407; Kimmel, A. R. (1987) Methods Enzymol. 152:507-511.) For example, stringent salt concentration will ordinarily be less than about 750 mM NaCl and 75 mM trisodium citrate, preferably less than about 500 mM NaCl and 50 mM trisodium citrate, and most preferably less than about 250 mM NaCl and 25 mM trisodium citrate. Low stringency hybridization can be obtained in the absence of organic solvent, e.g., formamide, while high stringency hybridization can be obtained in the presence of at least about 35% formamide, and most preferably at least about 50% formamide. Stringent temperature conditions will ordinarily include temperatures of at least about 30° C., more preferably of at least about 37° C., and most preferably of at least about 42° C. Varying additional parameters, such as hybridization time, the concentration of detergent, e.g., sodium dodecyl sulfate (SDS), and the inclusion or exclusion of carrier DNA, are well known to those skilled in the art. Various levels of stringency are accomplished by combining these various conditions as needed. In a preferred embodiment, hybridization will occur at 30° C. in 750 mM NaCl, 75 mM trisodium citrate, and 1% SDS. In a more preferred embodiment, hybridization will occur at 37° C. in 500 mM NaCl, 50 mM trisodium citrate, 1% SDS, 35% formamide, and 100 μg/ml denatured salmon sperm DNA (ssDNA). In a most preferred embodiment, hybridization will occur at 42° C. in 250 mM NaCl, 25 mM trisodium citrate, 1% SDS, 50% formamide, and 200 μg/ml ssDNA. Useful variations on these conditions will be readily apparent to those skilled in the art.

[0083] The washing steps which follow hybridization can also vary in stringency. Wash stringency conditions can be defined by salt concentration and by temperature. As above, wash stringency can be increased by decreasing salt concentration or by increasing temperature. For example, stringent salt concentration for the wash steps will preferably be less than about 30 mM NaCl and 3 mM trisodium citrate, and most preferably less than about 15 mM NaCl and 1.5 mM trisodium citrate. Stringent temperature conditions for the wash steps will ordinarily include temperature of at least about 25° C., more preferably of at least about 42° C., and most preferably of at least about 68° C. In a preferred embodiment, wash steps will occur at 25° C. in 30 mM NaCl, 3 mM trisodium citrate, and 0.1% SDS. In a more preferred embodiment, wash steps will occur at 42° C. in 15 mM NaCl, 1.5 mM trisodium citrate, and 0.1% SDS. In a most preferred embodiment, wash steps will occur at 68° C. in 15 mM NaCl, 1.5 mM trisodium citrate, and 0.1% SDS. Additional variations on these conditions will be readily apparent to those skilled in the art.

[0084] Methods for DNA sequencing are well known in the art and may be used to practice any of the embodiments of the invention. The methods may employ such enzymes as the Klenow fragment of DNA polymerase I, SEQUENASE DNA polymerase (US Biochemical, Cleveland Ohio), Taq polymerase (Perkin-Elmer), thermostable T7 polymerase (Amersham Pharmacia Biotech, Piscataway N.J.), or combinations of polymerases and proofreading exonucleases such as those found in the ELONGASE amplification system (Life Technologies, Gaithersburg Md.). Preferably, sequence preparation is automated with machines such as the MICROLAB 2200 liquid transfer system (Hamilton, Reno Nev.), PTC200 thermal cycler (MJ Research, Watertown Mass.) and the ABI CATALYST 800 system (Perkin-Elmer). Sequencing is then carried out using either the ABI 373 or the the 377 DNA sequencing systems (Perkin-Elmer) or the MEGABACE 1000 DNA sequencing system (Molecular Dynamics, Sunnyvale Calif.). The resulting sequences are analyzed using a variety of algorithms which are well known in the art. (See, e.g., Ausubel, F. M. (1997) Short Protocols in Molecular Biology, John Wiley & Sons, New York N.Y., unit 7.7; Meyers, R. A. (1995) Molecular Biology and Biotechnology, Wiley VCH, New York N.Y., pp. 856-853.)

[0085] The nucleic acid sequences encoding RNABP may be extended utilizing a partial nucleotide sequence and employing various PCR-based methods known in the art to detect upstream sequences, such as promoters and regulatory elements. For example, one method which may be employed, restriction-site PCR, uses universal and nested primers to amplify unknown sequence from genomic DNA within a cloning vector. (See, e.g., Sarkar, G. (1993) PCR Methods Applic. 2:318-322.) Another method, inverse PCR, uses primers that extend in divergent directions to amplify unknown sequence from a circularized template. The template is derived from restriction fragments comprising a known genomic locus and surrounding sequences. (See, e.g., Triglia, T. et al. (1988) Nucleic Acids Res. 16:8186.) A third method, capture PCR, involves PCR amplification of DNA fragments adjacent to known sequences in human and yeast artificial chromosome DNA. (See, e.g., Lagerstrom, M. et al. (1991) PCR Methods Applic. 1:111-119.) In this method, multiple restriction enzyme digestions and ligations may be used to insert an engineered double-stranded sequence into a region of unknown sequence before performing PCR. Other methods which may be used to retrieve unknown sequences are known in the art. (See, e.g., Parker, J. D. et al. (1991) Nucleic Acids Res. 19:3055-306). Additionally, one may use PCR, nested primers, and PROMOTERFINDER libraries (Clontech, Palo Alto Calif.) to walk genomic DNA. This procedure avoids the need to screen libraries and is useful in finding intron/exon junctions. For all PCR-based methods, primers may be designed using commercially available software, such as OLIGO 4.06 primer analysis software (National Biosciences, Plymouth Minn.) or another appropriate program, to be about 22 to 30 nucleotides in length, to have a GC content of about 50% or more, and to anneal to the template at temperatures of about 68° C. to 72° C.

[0086] When screening for full-length cDNAs, it is preferable to use libraries that have been size-selected to include larger cDNAs. In addition, random-primed libraries, which often include sequences containing the 5′ regions of genes, are preferable for situations in which an oligo d(T) library does not yield a full-length cDNA. Genomic libraries may be useful for extension of sequence into 5′ non-transcribed regulatory regions.

[0087] Capillary electrophoresis systems which are commercially available may be used to analyze the size or confirm the nucleotide sequence of sequencing or PCR products. In particular, capillary sequencing may employ flowable polymers for electrophoretic separation, four different nucleotide-specific, laser-stimulated fluorescent dyes, and a charge coupled device camera for detection of the emitted wavelengths. Output/light intensity may be converted to electrical signal using appropriate software (e.g., GENOTYPER and SEQUENCE NAVIGATOR software, Perkin-Elmer), and the entire process from loading of samples to computer analysis and electronic data display may be computer controlled. Capillary electrophoresis is especially preferable for sequencing small DNA fragments which may be present in limited amounts in a particular sample.

[0088] In another embodiment of the invention, polynucleotide sequences or fragments thereof which encode RNABP may be cloned in recombinant DNA molecules that direct expression of RNABP, or fragments or functional equivalents thereof, in appropriate host cells. Due to the inherent degeneracy of the genetic code, other DNA sequences which encode substantially the same or a functionally equivalent amino acid sequence may be produced and used to express RNABP.

[0089] The nucleotide sequences of the present invention can be engineered using methods generally known in the art in order to alter RNABP-encoding sequences for a variety of purposes including, but not limited to, modification of the cloning, processing, and/or expression of the gene product. DNA shuffling by random fragmentation and PCR reassembly of gene fragments and synthetic oligonucleotides may be used to engineer the nucleotide sequences. For example, oligonucleotide-mediated site-directed mutagenesis may be used to introduce mutations that create new restriction sites, alter glycosylation patterns, change codon preference, produce splice variants, and so forth.

[0090] In another embodiment, sequences encoding RNABP may be synthesized, in whole or in part, using chemical methods well known in the art. (See, e.g., Caruthers, M. H. et al. (1980) Nucl. Acids Res. Symp. Ser. 215-223, and Horn, T. et al. (1980) Nucl. Acids Res. Symp. Ser. 225-232.) Alternatively, RNABP itself or a fragment thereof may be synthesized using chemical methods. For example, peptide synthesis can be performed using various solid-phase techniques. (See, e.g., Roberge, J. Y. et al. (1995) Science 269:202-204.) Automated synthesis may be achieved using the ABI 431A peptide synthesizer (Perkin-Elmer). Additionally, the amino acid sequence of RNABP, or any part thereof, may be altered during direct synthesis and/or combined with sequences from other proteins, or any part thereof, to produce a variant polypeptide.

[0091] The peptide may be substantially purified by preparative high performance liquid chromatography. (See, e.g, Chiez, R. M. and F. Z. Regnier (1990) Methods Enzymol. 182:392-421.) The composition of the synthetic peptides may be confirmed by amino acid analysis or by sequencing. (See, e.g., Creighton, T. (1984) Proteins, Structures and Molecular Properties, W H Freeman, New York N.Y.)

[0092] In order to express a biologically active RNABP, the nucleotide sequences encoding RNABP or derivatives thereof may be inserted into an appropriate expression vector, i.e., a vector which contains the necessary elements for transcriptional and translational control of the inserted coding sequence in a suitable host. These elements include regulatory sequences, such as enhancers, constitutive and inducible promoters, and 5′ and 3′ untranslated regions in the vector and in polynucleotide sequences encoding RNABP. Such elements may vary in their strength and specificity. Specific initiation signals may also be used to achieve more efficient translation of sequences encoding RNABP. Such signals include the ATG initiation codon and adjacent sequences, e.g., the Kozak sequence. In cases where sequences encoding RNABP and its initiation codon and upstream regulatory sequences are inserted into the appropriate expression vector, no additional transcriptional or translational control signals may be needed. However, in cases where only coding sequence, or a fragment thereof, is inserted, exogenous translational control signals including an in-frame ATG initiation codon should be provided by the vector. Exogenous translational elements and initiation codons may be of various origins, both natural and synthetic. The efficiency of expression may be enhanced by the inclusion of enhancers appropriate for the particular host cell system used. (See, e.g., Scharf, D. et al. (1994) Results Probl. Cell Differ. 20:125-162.) Methods which are well known to those skilled in the art may be used to construct expression vectors containing sequences encoding RNABP and appropriate transcriptional and translational control elements. These methods include in vitro recombinant DNA techniques, synthetic techniques, and in vivo genetic recombination. (See, e.g., Sambrook, J. et al. (1989) Molecular Cloning, A Laboratory Manual, Cold Spring Harbor Press, Plainview N.Y., ch. 4, 8, and 16-17; Ausubel, F. M. et al. (1995) Current Protocols in Molecular Biology, John Wiley & Sons, New York N.Y., ch. 9, 13, and 16.)

[0093] A variety of expression vector/host systems may be utilized to contain and express sequences encoding RNABP. These include, but are not limited to, microorganisms such as bacteria transformed with recombinant bacteriophage, plasmid, or cosmid DNA expression vectors; yeast transformed with yeast expression vectors; insect cell systems infected with viral expression vectors (e.g., baculovirus); plant cell systems transformed with viral expression vectors (e.g., cauliflower mosaic virus, CaMV, or tobacco mosaic virus, TMV) or with bacterial expression vectors (e.g., Ti or pBR322 plasmids); or animal cell systems. The invention is not limited by the host cell employed.

[0094] In bacterial systems, a number of cloning and expression vectors may be selected depending upon the use intended for polynucleotide sequences encoding RNABP. For example, routine cloning, subcloning, and propagation of polynucleotide sequences encoding RNABP can be achieved using a multifunctional E. coli vector such as the PBLUESCRIPT plasmid (Stratagene, La Jolla Calif.) or PSPORT1 plasmid (Life Technologies). Ligation of sequences encoding RNABP into the vector's multiple cloning site disrupts the lacZ gene, allowing a colorimetric screening procedure for identification of transformed bacteria containing recombinant molecules. In addition, these vectors may be useful for in vitro transcription, dideoxy sequencing, single strand rescue with helper phage, and creation of nested deletions in the cloned sequence. (See, e.g., Van Heeke, G. and S. M. Schuster (1989) J. Biol. Chem. 264:5503-5509.) When large quantities of RNABP are needed, e.g., for the production of antibodies, vectors which direct high level expression of RNABP may be used. For example, vectors containing the strong, inducible T5 or T7 bacteriophage promoter may be used.

[0095] Yeast expression systems may be used for production of RNABP. A number of vectors containing constitutive or inducible promoters, such as alpha factor, alcohol oxidase, and PGH, may be used in the yeast Saccharomyces cerevisiae or Pichia pastoris. In addition, such vectors direct either the secretion or intracellular retention of expressed proteins and enable integration of foreign sequences into the host genome for stable propagation. (See, e.g., Ausubel, 1995, supra; Grant et al. (1987) Methods Enzymol. 153:516-54; and Scorer, C. A. et al. (1994) Bio/Technology 12:181-184.)

[0096] Plant systems may also be used for expression of RNABP. Transcription of sequences encoding RNABP may be driven viral promoters, e.g., the 35S and 19S promoters of CaMV used alone or in combination with the omega leader sequence from TMV (Takamatsu, N. (1987) EMBO J. 6:307-311). Alternatively, plant promoters such as the small subunit of RUBISCO or heat shock promoters may be used. (See, e.g., Coruzzi, G. et al. (1984) EMBO J. 3:1671-1680; Broglie, R. et al. (1984) Science 224:838-843; and Winter, J. et al. (1991) Results Probl. Cell Differ. 17:85-105.) These constructs can be introduced into plant cells by direct DNA transformation or pathogen-mediated transfection. (See, e.g., The McGraw Hill Yearbook of Science and Technology (1992) McGraw Hill, New York N.Y., pp. 191-196.)

[0097] In mammalian cells, a number of viral-based expression systems may be utilized. In cases where an adenovirus is used as an expression vector, sequences encoding RNABP may be ligated into an adenovirus transcription/translation complex consisting of the late promoter and tripartite leader sequence. Insertion in a non-essential E1 or E3 region of the viral genome may be used to obtain infective virus which expresses RNABP in host cells. (See, e.g., Logan, J. and T. Shenk (1984) Proc. Natl. Acad. Sci. 81:3655-3659.) In addition, transcription enhancers, such as the Rous sarcoma virus (RSV) enhancer, may be used to increase expression in mammalian host cells. SV40 or EBV-based vectors may also be used for high-level protein expression.

[0098] Human artificial chromosomes (HACs) may also be employed to deliver larger fragments of DNA than can be contained in and expressed from a plasmid. HACs of about 6 kb to 10 Mb are constructed and delivered via conventional delivery methods (liposomes, polycationic amino polymers, or vesicles) for therapeutic purposes. (See, e.g., Harrington, J. J. et al. (1997) Nat. Genet. 15:345-355.)

[0099] For long term production of recombinant proteins in mammalian systems, stable expression of RNABP in cell lines is preferred. For example, sequences encoding RNABP can be transformed into cell lines using expression vectors which may contain viral origins of replication and/or endogenous expression elements and a selectable marker gene on the same or on a separate vector. Following the introduction of the vector, cells may be allowed to grow for about 1 to 2 days in enriched media before being switched to selective media. The purpose of the selectable marker is to confer resistance to a selective agent, and its presence allows growth and recovery of cells which successfully express the introduced sequences. Resistant clones of stably transformed cells may be propagated using tissue culture techniques appropriate to the cell type.

[0100] Any number of selection systems may be used to recover transformed cell lines. These include, but are not limited to, the herpes simplex virus thymidine kinase and adenine phosphoribosyltransferase genes, for use in tk⁻ or apr⁻ cells, respectively. (See, e.g., Wigler, M. et al. (1977) Cell 11:223-232; Lowy, I. et al. (1980) Cell 22:817-823.) Also, antimetabolite, antibiotic, or herbicide resistance can be used as the basis for selection. For example, dhfr confers resistance to methotrexate; neo confers resistance to the aminoglycosides, neomycin and G-418; and a/s and pat confer resistance to chlorsulfuron and phosphinotricin acetyltransferase, respectively. (See, e.g., Wigler, M. et al. (1980) Proc. Natl. Acad. Sci. 77:3567-3570; Colbere-Garapin, F. et al. (1981) J. Mol. Biol. 150:1-14.) Additional selectable genes have been described, e.g., trpB and hisD, which alter cellular requirements for metabolites. (See, e.g., Hartman, S. C. and R. C. Mulligan (1988) Proc. Natl. Acad. Sci. 85:8047-8051.) Visible markers, e.g., anthocyanins, green fluorescent proteins (GFP; Clontech), β-glucuronidase and its substrate β-glucuronide, or luciferase and its substrate luciferin may be used. These markers can be used not only to identify transformants, but also to quantify the amount of transient or stable protein expression attributable to a specific vector system. (See, e.g., Rhodes, C.A. (1995) Methods Mol. Biol. 55:121-131.)

[0101] Although the presence/absence of marker gene expression suggests that the gene of interest is also present, the presence and expression of the gene may need to be confirmed. For example, if the sequence encoding RNABP is inserted within a marker gene sequence, transformed cells containing sequences encoding RNABP can be identified by the absence of marker gene function. Alternatively, a marker gene can be placed in tandem with a sequence encoding RNABP under the control of a single promoter. Expression of the marker gene in response to induction or selection usually indicates expression of the tandem gene as well.

[0102] In general, host cells that contain the nucleic acid sequence encoding RNABP and that express RNABP may be identified by a variety of procedures known to those of skill in the art. These procedures include, but are not limited to, DNA-DNA or DNA-RNA hybridizations, PCR amplification, and protein bioassay or immunoassay techniques which include membrane, solution, or chip based technologies for the detection and/or quantification of nucleic acid or protein sequences.

[0103] Immunological methods for detecting and measuring the expression of RNABP using either specific polyclonal or monoclonal antibodies are known in the art. Examples of such techniques include enzyme-linked immunosorbent assays (ELISAs), radioimmunoassays (RIAs), and fluorescence activated cell sorting (FACS). A two-site, monoclonal-based immunoassay utilizing monoclonal antibodies reactive to two non-interfering epitopes on RNABP is preferred, but a competitive binding assay may be employed. These and other assays are well known in the art. (See, e.g., Hampton, R. et al. (1990) Serological Methods, a Laboratory Manual, APS Press, St Paul Minn., Sect. IV; Coligan, J. E. et al. (1997) Current Protocols in Immunology, Greene Pub. Associates and Wiley-Interscience, New York N.Y.; and Pound, J. D. (1998) Immunochemical Protocols, Humana Press, Totowa N.J.).

[0104] A wide variety of labels and conjugation techniques are known by those skilled in the art and may be used in various nucleic acid and amino acid assays. Means for producing labeled hybridization or PCR probes for detecting sequences related to polynucleotides encoding RNABP include oligolabeling, nick translation, end-labeling, or PCR amplification using a labeled nucleotide. Alternatively, the sequences encoding RNABP, or any fragments thereof, may be cloned into a vector for the production of an mRNA probe. Such vectors are known in the art, are commercially available, and may be used to synthesize RNA probes in vitro by addition of an appropriate RNA polymerase such as T7, T3, or SP6 and labeled nucleotides. These procedures may be conducted using a variety of commercially available kits, such as those provided by Amersham Pharmacia Biotech, Promega (Madison Wis.), and US Biochemical. Suitable reporter molecules or labels which may be used for ease of detection include radionuclides, enzymes, fluorescent, chemiluminescent, or chromogenic agents, as well as substrates, cofactors, inhibitors, magnetic particles, and the like.

[0105] Host cells transformed with nucleotide sequences encoding RNABP may be cultured under conditions suitable for the expression and recovery of the protein from cell culture. The protein produced by a transformed cell may be secreted or retained intracellularly depending on the sequence and/or the vector used. As will be understood by those of skill in the art, expression vectors containing polynucleotides which encode RNABP may be designed to contain signal sequences which direct secretion of RNABP through a prokaryotic or eukaryotic cell membrane.

[0106] In addition, a host cell strain may be chosen for its ability to modulate expression of the inserted sequences or to process the expressed protein in the desired fashion. Such modifications of the polypeptide include, but are not limited to, acetylation, carboxylation, glycosylation, phosphorylation, lipidation, and acylation. Post-translational processing which cleaves a “prepro” form of the protein may also be used to specify protein targeting, folding, and/or activity. Different host cells which have specific cellular machinery and characteristic mechanisms for post-translational activities (e.g., CHO, HeLa, MDCK, HEK293, and W138), are available from the American Type Culture Collection (ATCC, Manassas Va.) and may be chosen to ensure the correct modification and processing of the foreign protein.

[0107] In another embodiment of the invention, natural, modified, or recombinant nucleic acid sequences encoding RNABP may be ligated to a heterologous sequence resulting in translation of a fusion protein in any of the aforementioned host systems. For example, a chimeric RNABP protein containing a heterologous moiety that can be recognized by a commercially available antibody may facilitate the screening of peptide libraries for inhibitors of RNABP activity. Heterologous protein and peptide moieties may also facilitate purification of fusion proteins using commercially available affinity matrices. Such moieties include, but are not limited to, glutathione S-transferase (GST), maltose binding protein (MBP), thioredoxin (Trx), calmodulin binding peptide (CBP), 6-His, FLAG epitope (Sigma-Aldrich, St. Louis Mo.), c-myc, and hemagglutinin (HA). GST, MBP, Trx, CBP, and 6-His enable purification of their cognate fusion proteins on immobilized glutathione, maltose, phenylarsine oxide, calmodulin, and metal-chelate resins, respectively. The FLAG epitope (Sigma-Aldrich), c-myc, and hemagglutinin (HA) enable immunoaffinity purification of fusion proteins using commercially available monoclonal and polyclonal antibodies that specifically recognize these epitope tags. A fusion protein may also be engineered to contain a proteolytic cleavage site located between the RNABP encoding sequence and the heterologous protein sequence, so that RNABP may be cleaved away from the heterologous moiety following purification. Methods for fusion protein expression and purification are discussed in Ausubel (1995, supra, ch. 10). A variety of commercially available kits may also be used to facilitate expression and purification of fusion proteins.

[0108] In a further embodiment of the invention, synthesis of radiolabeled RNABP may be achieved in vitro using the TNT rabbit reticulocyte lysate or wheat germ extract systems (Promega). These systems couple transcription and translation of protein-coding sequences operably associated with the T?, T3, or SP6 promoters. Translation takes place in the presence of a radiolabeled amino acid precursor, preferably ³⁵S-methionine.

[0109] Fragments of RNABP may be produced not only by recombinant production, but also by direct peptide synthesis using solid-phase techniques. (See, e.g., Creighton, supra, pp. 55-60.) Protein synthesis may be performed by manual techniques or by automation. Automated synthesis may be achieved, for example, using the ABI 431A peptide synthesizer (Perkin-Elmer). Various fragments of RNABP may be synthesized separately and then combined to produce the full length molecule.

[0110] Therapeutics

[0111] Chemical and structural similarity, e.g., in the context of sequences and motifs, exists between regions of RNABP and RNA binding proteins such as DEAD-box RNA helicases and RNPs. In addition, the expression of RNABP is closely associated with cancer and proliferating tissue and the immune response. Therefore, RNABP appears to play a role in cancer, immune disorders, and developmental disorders. In the treatment of cancer, immune disorders, and developmental disorders associated with increased RNABP expression or activity, it is desirable to decrease the expression or activity of RNABP. In the treatment of the above conditions associated with decreased RNABP expression or activity, it is desirable to increase the expression or activity of RNABP.

[0112] Therefore, in one embodiment, RNABP or a fragment or derivative thereof may be administered to a subject to treat or prevent a disorder associated with decreased expression or activity of RNABP. Examples of such disorders include, but are not limited to, cancers such as adenocarcinoma, leukemia, lymphoma, melanoma, myeloma, sarcoma, teratocarcinoma, and, in particular, cancers of the adrenal gland, bladder, bone, bone marrow, brain, breast, cervix, gall bladder, ganglia, gastrointestinal tract, heart, kidney, liver, lung, muscle, ovary, pancreas, parathyroid, penis, prostate, salivary glands, skin, spleen, testis, thymus, thyroid, and uterus; immune disorders such as acquired immunodeficiency syndrome (AIDS), Addison's disease, adult respiratory distress syndrome, allergies, ankylosing spondylitis, amyloidosis, anemia, asthma, atherosclerosis, autoimmune hemolytic anemia, autoimmune thyroiditis, bronchitis, cholecystitis, contact dermatitis, Crohn's disease, atopic dermatitis, dermatomyositis, diabetes mellitus, emphysema, episodic lymphopenia with lymphocytotoxins, erythroblastosis fetalis, erythema nodosum, atrophic gastritis, glomerulonephritis, Goodpasture's syndrome, gout, Graves' disease, Hashimoto's thyroiditis, hypereosinophilia, irritable bowel syndrome, multiple sclerosis, myasthenia gravis, myocardial or pericardial inflammation, osteoarthritis, osteoporosis, pancreatitis, polymyositis, psoriasis, Reiter's syndrome, rheumatoid arthritis, scleroderma, Sjogren's syndrome, systemic anaphylaxis, systemic lupus erythematosus, systemic sclerosis, thrombocytopenic purpura, ulcerative colitis, uveitis, Werner syndrome, complications of cancer, hemodialysis, and extracorporeal circulation, viral, bacterial, fungal, parasitic, protozoal, and helminthic infections, trauma, X-linked agammaglobinemia of Bruton, common variable immunodeficiency (CVI), DiGeorge's syndrome (thymic hypoplasia), thymic dysplasia, isolated IgA deficiency, severe combined immunodeficiency disease (SCID), immunodeficiency with thrombocytopenia and eczema (Wiskott-Aldrich syndrome), Chediak-Higashi syndrome, chronic granulomatous diseases, hereditary angioneurotic edema, and immunodeficiency associated with Cushing's disease; and developmental disorders such as renal tubular acidosis, anemia, Cushing's syndrome, achondroplastic dwarfism, Duchenne and Becker muscular dystrophy, epilepsy, gonadal dysgenesis, WAGR syndrome (Wilms' tumor, aniridia, genitourinary abnormalities, and mental retardation), Smith-Magenis syndrome, myelodysplastic syndrome, hereditary mucoepithelial dysplasia, hereditary keratodermas, hereditary neuropathies such as Charcot-Marie-Tooth disease and neurofibromatosis, hypothyroidism, hydrocephalus, seizure disorders such as Syndenham's chorea and cerebral palsy, spina bifida, anencephaly, craniorachischisis, congenital glaucoma, cataract, sensorineural hearing loss, and any disorder associated with cell growth and differentiation, embryogenesis, and morphogenesis involving any tissue, organ, or system of a subject, e.g., the brain, adrenal gland, kidney, skeletal or reproductive system.

[0113] In another embodiment, a vector capable of expressing RNABP or a fragment or derivative thereof may be administered to a subject to treat or prevent a disorder associated with decreased expression or activity of RNABP including, but not limited to, those described above.

[0114] In a further embodiment, a pharmaceutical composition comprising a substantially purified RNABP in conjunction with a suitable pharmaceutical carrier may be administered to a subject to treat or prevent a disorder associated with decreased expression or activity of RNABP including, but not limited to, those provided above.

[0115] In still another embodiment, an agonist which modulates the activity of RNABP may be administered to a subject to treat or prevent a disorder associated with decreased expression or activity of RNABP including, but not limited to, those listed above.

[0116] In a further embodiment, an antagonist of RNABP may be administered to a subject to treat or prevent a disorder associated with increased expression or activity of RNABP. Examples of such disorders include, but are not limited to, those cancers, immune disorders, and developmental disorders described above. In one aspect, an antibody which specifically binds RNABP may be used directly as an antagonist or indirectly as a targeting or delivery mechanism for bringing a pharmaceutical agent to cells or tissue which express RNABP.

[0117] In an additional embodiment, a vector expressing the complement of the polynucleotide encoding RNABP may be administered to a subject to treat or prevent a disorder associated with increased expression or activity of RNABP including, but not limited to, those described above.

[0118] In other embodiments, any of the proteins, antagonists, antibodies, agonists, complementary sequences, or vectors of the invention may be administered in combination with other appropriate therapeutic agents. Selection of the appropriate agents for use in combination therapy may be made by one of ordinary skill in the art, according to conventional pharmaceutical principles. The combination of therapeutic agents may act synergistically to effect the treatment or prevention of the various disorders described above. Using this approach, one may be able to achieve therapeutic efficacy with lower dosages of each agent, thus reducing the potential for adverse side effects.

[0119] An antagonist of RNABP may be produced using methods which are generally known in the art. In particular, purified RNABP may be used to produce antibodies or to screen libraries of pharmaceutical agents to identify those which specifically bind RNABP. Antibodies to RNABP may also be generated using methods that are well known in the art. Such antibodies may include, but are not limited to, polyclonal, monoclonal, chimeric, and single chain antibodies, Fab fragments, and fragments produced by a Fab expression library. Neutralizing antibodies (i.e., those which inhibit dimer formation) are especially preferred for therapeutic use.

[0120] For the production of antibodies, various hosts including goats, rabbits, rats, mice, humans, and others may be immunized by injection with RNABP or with any fragment or oligopeptide thereof which has immunogenic properties. Depending on the host species, various adjuvants may be used to increase immunological response. Such adjuvants include, but are not limited to, Freund's, mineral gels such as aluminum hydroxide, and surface active substances such as lysolecithin, pluronic polyols, polyanions, peptides, oil emulsions, KLH, and dinitrophenol. Among adjuvants used in humans, BCG (bacilli Calmette-Guerin) and Corynebacterium parvum are especially preferable.

[0121] It is preferred that the oligopeptides, peptides, or fragments used to induce antibodies to RNABP have an amino acid sequence consisting of at least about 5 amino acids, and, more preferably, of at least about 10 amino acids. It is also preferable that these oligopeptides, peptides, or fragments are identical to a portion of the amino acid sequence of the natural protein and contain the entire amino acid sequence of a small, naturally occurring molecule. Short stretches of RNABP amino acids may be fused with those of another protein, such as KLH, and antibodies to the chimeric molecule may be produced.

[0122] Monoclonal antibodies to RNABP may be prepared using any technique which provides for the production of antibody molecules by continuous cell lines in culture. These include, but are not limited to, the hybridoma technique, the human B-cell hybridoma technique, and the EBV-hybridoma technique. (See, e.g., Kohler, G. et al. (1975) Nature 256:495-497; Kozbor, D. et al. (1985) J. Immunol. Methods 81:31-42; Cote, R. J. et al. (1983) Proc. Natl. Acad. Sci. 80:2026-2030; and Cole, S. P. et al. (1984) Mol. Cell Biol. 62:109-120.)

[0123] In addition, techniques developed for the production of “chimeric antibodies,” such as the splicing of mouse antibody genes to human antibody genes to obtain a molecule with appropriate antigen specificity and biological activity, can be used. (See, e.g., Morrison, S. L. et al. (1984) Proc. Natl. Acad. Sci. 81:6851-6855; Neuberger, M. S. et al. (1984) Nature 312:604-608; and Takeda, S. et al. (1985) Nature 314:452-454.) Alternatively, techniques described for the production of single chain antibodies may be adapted, using methods known in the art, to produce RNABP-specific single chain antibodies. Antibodies with related specificity, but of distinct idiotypic composition, may be generated by chain shuffling from random combinatorial immunoglobulin libraries. (See, e.g., Burton D. R. (1991) Proc. Natl. Acad. Sci. 88:10134-10137.)

[0124] Antibodies may also be produced by inducing in vivo production in the lymphocyte population or by screening immunoglobulin libraries or panels of highly specific binding reagents as disclosed in the literature. (See, e.g., Orlandi, R. et al. (1989) Proc. Natl. Acad. Sci. 86: 3833-3837; Winter, G. et al. (1991) Nature 349:293-299.)

[0125] Antibody fragments which contain specific binding sites for RNABP may also be generated. For example, such fragments include, but are not limited to, F(ab′)2 fragments produced by pepsin digestion of the antibody molecule and Fab fragments generated by reducing the disulfide bridges of the F(ab′)2 fragments. Alternatively, Fab expression libraries may be constructed to allow rapid and easy identification of monoclonal Fab fragments with the desired specificity. (See, e.g., Huse, W. D. et al. (1989) Science 246:1275-1281.)

[0126] Various immunoassays may be used for screening to identify antibodies having the desired specificity. Numerous protocols for competitive binding or immunoradiometric assays using either polyclonal or monoclonal antibodies with established specificities are well known in the art. Such immunoassays typically involve the measurement of complex formation between RNABP and its specific antibody. A two-site, monoclonal-based immunoassay utilizing monoclonal antibodies reactive to two non-interfering RNABP epitopes is preferred, but a competitive binding assay may also be employed (Pound, supra).

[0127] Various methods such as Scatchard analysis in conjunction with radioimmunoassay techniques may be used to assess the affinity of antibodies for RNABP. Affinity is expressed as an association constant, K_(a), which is defined as the molar concentration of RNABP-antibody complex divided by the molar concentrations of free antigen and free antibody under equilibrium conditions. The K_(a) determined for a preparation of polyclonal antibodies, which are heterogeneous in their affinities for multiple RNABP epitopes, represents the average affinity, or avidity, of the antibodies for RNABP. The K_(a) determined for a preparation of monoclonal antibodies, which are monospecific for a particular RNABP epitope, represents a true measure of affinity. High-affinity antibody preparations with K_(a) ranging from about 10⁹ to 10¹² L/mole are preferred for use in immunoassays in which the RNABP-antibody complex must withstand rigorous manipulations. Low-affinity antibody preparations with K_(a) ranging from about 10⁶ to 10⁷ L/mole are preferred for use in immunopurification and similar procedures which ultimately require dissociation of RNABP, preferably in active form, from the antibody (Catty, D. (1988) Antibodies, Volume I: A Practical Approach, IRL Press, Washington, D.C.; Liddell, J. E. and Cryer, A. (1991) A Practical Guide to Monoclonal Antibodies, John Wiley & Sons, New York N.Y.).

[0128] The titer and avidity of polyclonal antibody preparations may be further evaluated to determine the quality and suitability of such preparations for certain downstream applications. For example, a polyclonal antibody preparation containing at least 1-2 mg specific antibody/ml, preferably 5-10 mg specific antibody/ml, is preferred for use in procedures requiring precipitation of RNABP-antibody complexes. Procedures for evaluating antibody specificity, titer, and avidity, and guidelines for antibody quality and usage in various applications, are generally available. (See, e.g., Catty, supra, and Coligan et al. supra.)

[0129] In another embodiment of the invention, the polynucleotides encoding RNABP, or any fragment or complement thereof, may be used for therapeutic purposes. In one aspect, the complement of the polynucleotide encoding RNABP may be used in situations in which it would be desirable to block the transcription of the mRNA. In particular, cells may be transformed with sequences complementary to polynucleotides encoding RNABP. Thus, complementary molecules or fragments may be used to modulate RNABP activity, or to achieve regulation of gene function. Such technology is now well known in the art, and sense or antisense oligonucleotides or larger fragments can be designed from various locations along the coding or control regions of sequences encoding RNABP.

[0130] Expression vectors derived from retroviruses, adenoviruses, or herpes or vaccinia viruses, or from various bacterial plasmids, may be used for delivery of nucleotide sequences to the targeted organ, tissue, or cell population. Methods which are well known to those skilled in the art can be used to construct vectors to express nucleic acid sequences complementary to the polynucleotides encoding RNABP. (See, e.g., Sambrook, supra; Ausubel, 1995, supra.)

[0131] Genes encoding RNABP can be turned off by transforming a cell or tissue with expression vectors which express high levels of a polynucleotide, or fragment thereof, encoding RNABP. Such constructs may be used to introduce untranslatable sense or antisense sequences into a cell. Even in the absence of integration into the DNA, such vectors may continue to transcribe RNA molecules until they are disabled by endogenous nucleases. Transient expression may last for a month or more with a non-replicating vector, and may last even longer if appropriate replication elements are part of the vector system.

[0132] As mentioned above, modifications of gene expression can be obtained by designing complementary sequences or antisense molecules (DNA, RNA, or PNA) to the control, 5′, or regulatory regions of the gene encoding RNABP. Oligonucleotides derived from the transcription initiation site, e.g., between about positions −10 and +10 from the start site, are preferred. Similarly, inhibition can be achieved using triple helix base-pairing methodology. Triple helix pairing is useful because it causes inhibition of the ability of the double helix to open sufficiently for the binding of polymerases, transcription factors, or regulatory molecules. Recent therapeutic advances using triplex DNA have been described in the literature. (See, e.g., Gee, J. E. et al. (1994) in Huber, B. E. and B. I. Carr, Molecular and Immunologic Approaches, Futura Publishing, Mt. Kisco N.Y., pp. 163-177.) A complementary sequence or antisense molecule may also be designed to block translation of mRNA by preventing the transcript from binding to ribosomes.

[0133] Ribozymes, enzymatic RNA molecules, may also be used to catalyze the specific cleavage of RNA. The mechanism of ribozyme action involves sequence-specific hybridization of the ribozyme molecule to complementary target RNA, followed by endonucleolytic cleavage. For example, engineered hammerhead motif ribozyme molecules may specifically and efficiently catalyze endonucleolytic cleavage of sequences encoding RNABP.

[0134] Specific ribozyme cleavage sites within any potential RNA target are initially identified by scanning the target molecule for ribozyme cleavage sites, including the following sequences: GUA, GUU, and GUC. Once identified, short RNA sequences of between 15 and 20 ribonucleotides, corresponding to the region of the target gene containing the cleavage site, may be evaluated for secondary structural features which may render the oligonucleotide inoperable. The suitability of candidate targets may also be evaluated by testing accessibility to hybridization with complementary oligonucleotides using ribonuclease protection assays.

[0135] Complementary ribonucleic acid molecules and ribozymes of the invention may be prepared by any method known in the art for the synthesis of nucleic acid molecules. These include techniques for chemically synthesizing oligonucleotides such as solid phase phosphoramidite chemical synthesis. Alternatively, RNA molecules may be generated by in vitro and in vivo transcription of DNA sequences encoding RNABP. Such DNA sequences may be incorporated into a wide variety of vectors with suitable RNA polymerase promoters such as T7 or SP6. Alternatively, these cDNA constructs that synthesize complementary RNA, constitutively or inducibly, can be introduced into cell lines, cells, or tissues.

[0136] RNA molecules may be modified to increase intracellular stability and half-life. Possible modifications include, but are not limited to, the addition of flanking sequences at the 5′ and/or 3′ ends of the molecule, or the use of phosphorothioate or 2′ O-methyl rather than phosphodiesterase linkages within the backbone of the molecule. This concept is inherent in the production of PNAs and can be extended in all of these molecules by the inclusion of nontraditional nucleosides such as inosine, queosine, and wybutosine, as well as acetyl-, methyl-, thio-, and similarly modified forms of adenine, cytosine, guanine, thymine, and uracil which are not as easily recognized by endogenous endonucleases.

[0137] Many methods for introducing vectors into cells or tissues are available and equally suitable for use in vivo, in vitro, and ex vivo. For ex vivo therapy, vectors may be introduced into stem cells taken from the patient and clonally propagated for autologous transplant back into that same patient. Delivery by transfection, by liposome injections, or by polycationic amino polymers may be achieved using methods which are well known in the art. (See, e.g., Goldman, C. K. et al. (1997) Nature Biotechnology 15:462-466.)

[0138] Any of the therapeutic methods described above may be applied to any subject in need of such therapy, including, for example, mammals such as dogs, cats, cows, horses, rabbits, monkeys, and most preferably, humans.

[0139] An additional embodiment of the invention relates to the administration of a pharmaceutical or sterile composition, in conjunction with a pharmaceutically acceptable carrier, for any of the therapeutic effects discussed above. Such pharmaceutical compositions may consist of RNABP, antibodies to RNABP, and mimetics, agonists, antagonists, or inhibitors of RNABP. The compositions may be administered alone or in combination with at least one other agent, such as a stabilizing compound, which may be administered in any sterile, biocompatible pharmaceutical carrier including, but not limited to, saline, buffered saline, dextrose, and water. The compositions may be administered to a patient alone, or in combination with other agents, drugs, or hormones.

[0140] The pharmaceutical compositions utilized in this invention may be administered by any number of routes including, but not limited to, oral, intravenous, intramuscular, intra-arterial, intramedullary, intrathecal, intraventricular, transdermal, subcutaneous, intraperitoneal, intranasal, enteral, topical, sublingual, or rectal means.

[0141] In addition to the active ingredients, these pharmaceutical compositions may contain suitable pharmaceutically-acceptable carriers comprising excipients and auxiliaries which facilitate processing of the active compounds into preparations which can be used pharmaceutically. Further details on techniques for formulation and administration may be found in the latest edition of Remington's Pharmaceutical Sciences (Maack Publishing, Easton Pa.).

[0142] Pharmaceutical compositions for oral administration can be formulated using pharmaceutically acceptable carriers well known in the art in dosages suitable for oral administration. Such carriers enable the pharmaceutical compositions to be formulated as tablets, pills, dragees, capsules, liquids, gels, syrups, slurries, suspensions, and the like, for ingestion by the patient.

[0143] Pharmaceutical preparations for oral use can be obtained through combining active compounds with solid excipient and processing the resultant mixture of granules (optionally, after grinding) to obtain tablets or dragee cores. Suitable auxiliaries can be added, if desired. Suitable excipients include carbohydrate or protein fillers, such as sugars, including lactose, sucrose, mannitol, and sorbitol; starch from corn, wheat, rice, potato, or other plants; cellulose, such as methyl cellulose, hydroxypropylmethyl-cellulose, or sodium carboxymethylcellulose; gums, including arabic and tragacanth; and proteins, such as gelatin and collagen. If desired, disintegrating or solubilizing agents may be added, such as the cross-linked polyvinyl pyrrolidone, agar, and alginic acid or a salt thereof, such as sodium alginate.

[0144] Dragee cores may be used in conjunction with suitable coatings, such as concentrated sugar solutions, which may also contain gum arabic, talc, polyvinylpyrrolidone, carbopol gel, polyethylene glycol, and/or titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures. Dyestuffs or pigments may be added to the tablets or dragee coatings for product identification or to characterize the quantity of active compound, i.e., dosage.

[0145] Pharmaceutical preparations which can be used orally include push-fit capsules made of gelatin, as well as soft, sealed capsules made of gelatin and a coating, such as glycerol or sorbitol. Push-fit capsules can contain active ingredients mixed with fillers or binders, such as lactose or starches, lubricants, such as talc or magnesium stearate, and, optionally, stabilizers. In soft capsules, the active compounds may be dissolved or suspended in suitable liquids, such as fatty oils, liquid, or liquid polyethylene glycol with or without stabilizers.

[0146] Pharmaceutical formulations suitable for parenteral administration may be formulated in aqueous solutions, preferably in physiologically compatible buffers such as Hanks' solution, Ringer's solution, or physiologically buffered saline. Aqueous injection suspensions may contain substances which increase the viscosity of the suspension, such as sodium carboxymethyl cellulose, sorbitol, or dextran. Additionally, suspensions of the active compounds may be prepared as appropriate oily injection suspensions. Suitable lipophilic solvents or vehicles include fatty oils, such as sesame oil, or synthetic fatty acid esters, such as ethyl oleate, triglycerides, or liposomes. Non-lipid polycationic amino polymers may also be used for delivery. Optionally, the suspension may also contain suitable stabilizers or agents to increase the solubility of the compounds and allow for the preparation of highly concentrated solutions.

[0147] For topical or nasal administration, penetrants appropriate to the particular barrier to be permeated are used in the formulation. Such penetrants are generally known in the art.

[0148] The pharmaceutical compositions of the present invention may be manufactured in a manner that is known in the art, e.g., by means of conventional mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping, or lyophilizing processes.

[0149] The pharmaceutical composition may be provided as a salt and can be formed with many acids, including but not limited to, hydrochloric, sulfuric, acetic, lactic, tartaric, malic, and succinic acid. Salts tend to be more soluble in aqueous or other protonic solvents than are the corresponding free base forms. In other cases, the preferred preparation may be a lyophilized powder which may contain any or all of the following: 1 mM to 50 mM histidine, 0. 1% to 2% sucrose, and 2% to 7% mannitol, at a pH range of 4.5 to 5.5, that is combined with buffer prior to use.

[0150] After pharmaceutical compositions have been prepared, they can be placed in an appropriate container and labeled for treatment of an indicated condition. For administration of RNABP, such labeling would include amount, frequency, and method of administration.

[0151] Pharmaceutical compositions suitable for use in the invention include compositions wherein the active ingredients are contained in an effective amount to achieve the intended purpose. The determination of an effective dose is well within the capability of those skilled in the art.

[0152] For any compound, the therapeutically effective dose can be estimated initially either in cell culture assays, e.g., of neoplastic cells or in animal models such as mice, rats, rabbits, dogs, or pigs. An animal model may also be used to determine the appropriate concentration range and route of administration. Such information can then be used to determine useful doses and routes for administration in humans.

[0153] A therapeutically effective dose refers to that amount of active ingredient, for example RNABP or fragments thereof, antibodies of RNABP, and agonists, antagonists or inhibitors of RNABP, which ameliorates the symptoms or condition. Therapeutic efficacy and toxicity may be determined by standard pharmaceutical procedures in cell cultures or with experimental animals, such as by calculating the ED₅₀ (the dose therapeutically effective in 50% of the population) or LD₅₀ (the dose lethal to 50% of the population) statistics. The dose ratio of toxic to therapeutic effects is the therapeutic index, and it can be expressed as the LD₅₀/ED₅₀ ratio. Pharmaceutical compositions which exhibit large therapeutic indices are preferred. The data obtained from cell culture assays and animal studies are used to formulate a range of dosage for human use. The dosage contained in such compositions is preferably within a range of circulating concentrations that includes the ED₅₀ with little or no toxicity. The dosage varies within this range depending upon the dosage form employed, the sensitivity of the patient, and the route of administration.

[0154] The exact dosage will be determined by the practitioner, in light of factors related to the subject requiring treatment. Dosage and administration are adjusted to provide sufficient levels of the active moiety or to maintain the desired effect. Factors which may be taken into account include the severity of the disease state, the general health of the subject, the age, weight, and gender of the subject, time and frequency of administration, drug combination(s), reaction sensitivities, and response to therapy. Long-acting pharmaceutical compositions may be administered every 3 to 4 days, every week, or biweekly depending on the half-life and clearance rate of the particular formulation.

[0155] Normal dosage amounts may vary from about 0.1 μg to 100,000 μg, up to a total dose of about 1 gram, depending upon the route of administration. Guidance as to particular dosages and methods of delivery is provided in the literature and generally available to practitioners in the art. Those skilled in the art will employ different formulations for nucleotides than for proteins or their inhibitors. Similarly, delivery of polynucleotides or polypeptides will be specific to particular cells, conditions, locations, etc.

[0156] Diagnostics

[0157] In another embodiment, antibodies which specifically bind RNABP may be used for the diagnosis of disorders characterized by expression of RNABP, or in assays to monitor patients being treated with RNABP or agonists, antagonists, or inhibitors of RNABP. Antibodies useful for diagnostic purposes may be prepared in the same manner as described above for therapeutics. Diagnostic assays for RNABP include methods which utilize the antibody and a label to detect RNABP in human body fluids or in extracts of cells or tissues. The antibodies may be used with or without modification, and may be labeled by covalent or non-covalent attachment of a reporter molecule. A wide variety of reporter molecules, several of which are described above, are known in the art and may be used.

[0158] A variety of protocols for measuring RNABP, including ELISAs, RIAs, and FACS, are known in the art and provide a basis for diagnosing altered or abnormal levels of RNABP expression. Normal or standard values for RNABP expression are established by combining body fluids or cell extracts taken from normal mammalian subjects, preferably human, with antibody to RNABP under conditions suitable for complex formation. The amount of standard complex formation may be quantitated by various methods, preferably by photometric means. Quantities of RNABP expressed in subject, control, and disease samples from biopsied tissues are compared with the standard values. Deviation between standard and subject values establishes the parameters for diagnosing disease.

[0159] In another embodiment of the invention, the polynucleotides encoding RNABP may be used for diagnostic purposes. The polynucleotides which may be used include oligonucleotide sequences, complementary RNA and DNA molecules, and PNAs. The polynucleotides may be used to detect and quantitate gene expression in biopsied tissues in which expression of RNABP may be correlated with disease. The diagnostic assay may be used to determine absence, presence, and excess expression of RNABP, and to monitor regulation of RNABP levels during therapeutic intervention.

[0160] In one aspect, hybridization with PCR probes which are capable of detecting polynucleotide sequences, including genomic sequences, encoding RNABP or closely related molecules may be used to identify nucleic acid sequences which encode RNABP. The specificity of the probe, whether it is made from a highly specific region, e.g., the 5′ regulatory region, or from a less specific region, e.g., a conserved motif, and the stringency of the hybridization or amplification (maximal, high, intermediate, or low), will determine whether the probe identifies only naturally occurring sequences encoding RNABP, allelic variants, or related sequences.

[0161] Probes may also be used for the detection of related sequences, and should preferably have at least 50% sequence identity to any of the RNABP encoding sequences. The hybridization probes of the subject invention may be DNA or RNA and may be derived from the sequence of SEQ ID NO:4-6 or from genomic sequences including promoters, enhancers, and introns of the RNABP gene.

[0162] Means for producing specific hybridization probes for DNAs encoding RNABP include the cloning of polynucleotide sequences encoding RNABP or RNABP derivatives into vectors for the production of mRNA probes. Such vectors are known in the art, are commercially available, and may be used to synthesize RNA probes in vitro by means of the addition of the appropriate RNA polymerases and the appropriate labeled nucleotides. Hybridization probes may be labeled by a variety of reporter groups, for example, by radionuclides such as ³²P or ³⁵S, or by enzymatic labels, such as alkaline phosphatase coupled to the probe via avidin/biotin coupling systems, and the like.

[0163] Polynucleotide sequences encoding RNABP may be used for the diagnosis of disorders associated with expression of RNABP. Examples of such disorders include, but are not limited to, cancers such as adenocarcinoma, leukemia, lymphoma, melanoma, myeloma, sarcoma, teratocarcinoma, and, in particular, cancers of the adrenal gland, bladder, bone, bone marrow, brain, breast, cervix, gall bladder, ganglia, gastrointestinal tract, heart, kidney, liver, lung, muscle, ovary, pancreas, parathyroid, penis, prostate, salivary glands, skin, spleen, testis, thymus, thyroid, and uterus; immune disorders such as acquired immunodeficiency syndrome (AIDS), Addison's disease, adult respiratory distress syndrome, allergies, ankylosing spondylitis, amyloidosis, anemia, asthma, atherosclerosis, autoimmune hemolytic anemia, autoimmune thyroiditis, bronchitis, cholecystitis, contact dermatitis, Crohn's disease, atopic dermatitis, dermatomyositis, diabetes mellitus, emphysema, episodic lymphopenia with lymphocytotoxins, erythroblastosis fetalis, erythema nodosum, atrophic gastritis, glomerulonephritis, Goodpasture's syndrome, gout, Graves' disease, Hashimoto's thyroiditis, hypereosinophilia, irritable bowel syndrome, multiple sclerosis, myasthenia gravis, myocardial or pericardial inflammation, osteoarthritis, osteoporosis, pancreatitis, polymyositis, psoriasis, Reiter's syndrome, rheumatoid arthritis, scleroderma, Sjogren's syndrome, systemic anaphylaxis, systemic lupus erythematosus, systemic sclerosis, thrombocytopenic purpura, ulcerative colitis, uveitis, Werner syndrome, complications of cancer, hemodialysis, and extracorporeal circulation, viral, bacterial, fungal, parasitic, protozoal, and helminthic infections, trauma, X-linked agammaglobinemia of Bruton, common variable immunodeficiency (CVI), DiGeorge's syndrome (thymic hypoplasia), thymic dysplasia, isolated IgA deficiency, severe combined immunodeficiency disease (SCID), immunodeficiency with thrombocytopenia and eczema (Wiskott-Aldrich syndrome), Chediak-Higashi syndrome, chronic granulomatous diseases, hereditary angioneurotic edema, and immunodeficiency associated with Cushing's disease; and developmental disorders such as renal tubular acidosis, anemia, Cushing's syndrome, achondroplastic dwarfism, Duchenne and Becker muscular dystrophy, epilepsy, gonadal dysgenesis, WAGR syndrome (Wilms' tumor, aniridia, genitourinary abnormalities, and mental retardation), Smith-Magenis syndrome, myelodysplastic syndrome, hereditary mucoepithelial dysplasia, hereditary keratodermas, hereditary neuropathies such as Charcot-Marie-Tooth disease and neurofibromatosis, hypothyroidism, hydrocephalus, seizure disorders such as Syndenham's chorea and cerebral palsy, spina bifida, anencephaly, craniorachischisis, congenital glaucoma, cataract, sensorineural hearing loss, and any disorder associated with cell growth and differentiation, embryogenesis, and morphogenesis involving any tissue, organ, or system of a subject, e.g., the brain, adrenal gland, kidney, skeletal or reproductive system. The polynucleotide sequences encoding RNABP may be used in Southern or northern analysis, dot blot, or other membrane-based technologies; in PCR technologies; in dipstick, pin, and multiformat ELISA-like assays; and in microarrays utilizing fluids or tissues from patients to detect altered RNABP expression. Such qualitative or quantitative methods are well known in the art.

[0164] In a particular aspect, the nucleotide sequences encoding RNABP may be useful in assays that detect the presence of associated disorders, particularly those mentioned above. The nucleotide sequences encoding RNABP may be labeled by standard methods and added to a fluid or tissue sample from a patient under conditions suitable for the formation of hybridization complexes. After a suitable incubation period, the sample is washed and the signal is quantitated and compared with a standard value. If the amount of signal in the patient sample is significantly altered in comparison to a control sample then the presence of altered levels of nucleotide sequences encoding RNABP in the sample indicates the presence of the associated disorder. Such assays may also be used to evaluate the efficacy of a particular therapeutic treatment regimen in animal studies, in clinical trials, or to monitor the treatment of an individual patient.

[0165] In order to provide a basis for the diagnosis of a disorder associated with expression of RNABP, a normal or standard profile for expression is established. This may be accomplished by combining body fluids or cell extracts taken from normal subjects, either animal or human, with a sequence, or a fragment thereof, encoding RNABP, under conditions suitable for hybridization or amplification. Standard hybridization may be quantified by comparing the values obtained from normal subjects with values from an experiment in which a known amount of a substantially purified polynucleotide is used. Standard values obtained in this manner may be compared with values obtained from samples from patients who are symptomatic for a disorder. Deviation from standard values is used to establish the presence of a disorder.

[0166] Once the presence of a disorder is established and a treatment protocol is initiated, hybridization assays may be repeated on a regular basis to determine if the level of expression in the patient begins to approximate that which is observed in the normal subject. The results obtained from successive assays may be used to show the efficacy of treatment over a period ranging from several days to months.

[0167] With respect to cancer, the presence of an abnormal amount of transcript (either under- or overexpressed) in biopsied tissue from an individual may indicate a predisposition for the development of the disease, or may provide a means for detecting the disease prior to the appearance of actual clinical symptoms. A more definitive diagnosis of this type may allow health professionals to employ preventative measures or aggressive treatment earlier thereby preventing the development or further progression of the cancer.

[0168] Additional diagnostic uses for oligonucleotides designed from the sequences encoding RNABP may involve the use of PCR. These oligomers may be chemically synthesized, generated enzymatically, or produced in vitro. Oligomers will preferably contain a fragment of a polynucleotide encoding RNABP, or a fragment of a polynucleotide complementary to the polynucleotide encoding RNABP, and will be employed under optimized conditions for identification of a specific gene or condition. Oligomers may also be employed under less stringent conditions for detection or quantitation of closely related DNA or RNA sequences.

[0169] Methods which may also be used to quantitate the expression of RNABP include radiolabeling or biotinylating nucleotides, coamplification of a control nucleic acid, and interpolating results from standard curves. (See, e.g., Melby, P. C. et al. (1993) J. Immunol. Methods 159:235-244; Duplaa, C. et al. (1993) Anal. Biochem. 212:229-236.) The speed of quantitation of multiple samples may be accelerated by running the assay in an ELISA format where the oligomer of interest is presented in various dilutions and a spectrophotometric or colorimetric response gives rapid quantitation.

[0170] In further embodiments, oligonucleotides or longer fragments derived from any of the polynucleotide sequences described herein may be used as targets in a microarray. The microarray can be used to monitor the expression level of large numbers of genes simultaneously and to identify genetic variants, mutations, and polymorphisms. This information may be used to determine gene function, to understand the genetic basis of a disorder, to diagnose a disorder, and to develop and monitor the activities of therapeutic agents.

[0171] Microarrays may be prepared, used, and analyzed using methods known in the art. (See, e.g., Brennan, T. M. et al. (1995) U.S. Pat. No. 5,474,796; Schena, M. et al. (1996) Proc. Natl. Acad. Sci. 93:10614-10619; Baldeschweiler et al. (1995) PCT application WO95/251116; Shalon, D. et al. (1995) PCT application WO95/35505; Heller, R. A. et al. (1997) Proc. Natl. Acad. Sci. 94:2150-2155; and Heller, M. J. et al. (1997) U.S. Pat. No. 5,605,662.)

[0172] In another embodiment of the invention, nucleic acid sequences encoding RNABP may be used to generate hybridization probes useful in mapping the naturally occurring genomic sequence. The sequences may be mapped to a particular chromosome, to a specific region of a chromosome, or to artificial chromosome constructions, e.g., human artificial chromosomes (HACs), yeast artificial chromosomes (YACs), bacterial artificial chromosomes (BACs), bacterial P1 constructions, or single chromosome cDNA libraries. (See, e.g., Harrington, J. J. et al. (1997) Nat. Genet. 15:345-355; Price, C. M. (1993) Blood Rev. 7:127-134; and Trask, B. J. (1991) Trends Genet. 7:149-154.) Fluorescent in situ hybridization (FISH) may be correlated with other physical chromosome mapping techniques and genetic map data. (See, e.g., Heinz-Ulrich, et al. (1995) in Meyers, supra, pp. 965-968.) Examples of genetic map data can be found in various scientific journals or at the Online Mendelian Inheritance in Man (OMIM) site. Correlation between the location of the gene encoding RNABP on a physical chromosomal map and a specific disorder, or a predisposition to a specific disorder, may help define the region of DNA associated with that disorder. The nucleotide sequences of the invention may be used to detect differences in gene sequences among normal, carrier, and affected individuals.

[0173] In situ hybridization of chromosomal preparations and physical mapping techniques, such as linkage analysis using established chromosomal markers, may be used for extending genetic maps. Often the placement of a gene on the chromosome of another mammalian species, such as mouse, may reveal associated markers even if the number or arm of a particular human chromosome is not known. New sequences can be assigned to chromosomal arms by physical mapping. This provides valuable information to investigators searching for disease genes using positional cloning or other gene discovery techniques. Once the disease or syndrome has been crudely localized by genetic linkage to a particular genomic region, e.g., ataxia-telangiectasia to 11q22-23, any sequences mapping to that area may represent associated or regulatory genes for further investigation. (See, e.g., Gatti, R. A. et al. (1988) Nature 336:577-580.) The nucleotide sequence of the subject invention may also be used to detect differences in the chromosomal location due to translocation, inversion, etc., among normal, carrier, or affected individuals.

[0174] In another embodiment of the invention, RNABP, its catalytic or immunogenic fragments, or oligopeptides thereof can be used for screening libraries of compounds in any of a variety of drug screening techniques. The fragment employed in such screening may be free in solution, affixed to a solid support, borne on a cell surface, or located intracellularly. The formation of binding complexes between RNABP and the agent being tested may be measured.

[0175] Another technique for drug screening provides for high throughput screening of compounds having suitable binding affinity to the protein of interest. (See, e.g., Geysen, et al. (1984) PCT application WO84/03564.) In this method, large numbers of different small test compounds are synthesized on a solid substrate. The test compounds are reacted with RNABP, or fragments thereof, and washed. Bound RNABP is then detected by methods well known in the art. Purified RNABP can also be coated directly onto plates for use in the aforementioned drug screening techniques. Alternatively, non-neutralizing antibodies can be used to capture the peptide and immobilize it on a solid support.

[0176] In another embodiment, one may use competitive drug screening assays in which neutralizing antibodies capable of binding RNABP specifically compete with a test compound for binding RNABP. In this manner, antibodies can be used to detect the presence of any peptide which shares one or more antigenic determinants with RNABP.

[0177] In additional embodiments, the nucleotide sequences which encode RNABP may be used in any molecular biology techniques that have yet to be developed, provided the new techniques rely on properties of nucleotide sequences that are currently known, including, but not limited to, such properties as the triplet genetic code and specific base pair interactions.

[0178] The examples below are provided to illustrate the subject invention and are not included for the purpose of limiting the invention.

EXAMPLES

[0179] I. Construction of cDNA Libraries

[0180] BRAITUT01

[0181] The BRAITUT01 cDNA library was constructed using RNA isolated from brain tumor tissue removed from a 50-year-old Caucasian female during a frontal lobectomy. Pathology indicated recurrent grade 3 oligoastrocytoma with focal necrosis and extensive calcification. Patient history included speech disturbance, epilepsy, and radiation treatment. Family history included a brain tumor.

[0182] The frozen tissue was homogenized and lysed in guanidinium isothiocyanate solution using a POLYTRON-PT 3000 homogenizer (Brinkmann Instruments, Westbury N.Y.). RNA was isolated as per Stratagene's RNA isolation protocol. RNA was extracted once with acid phenol, precipitated with sodium acetate and ethanol, resuspended in RNase-free water, and treated with DNase. Poly (A+) RNA was isolated using the OLIGOTEX mRNA purification kit (QIAGEN, Chatsworth Calif.).

[0183] Poly(A+) RNA was used for cDNA synthesis and construction of the cDNA library according to the recommended protocols in the SUPERSCRIPT plasmid system (Life Technologies). The cDNAs were fractionated on a SEPHAROSE CL4B column (Amersham Pharmacia Biotech), and those cDNAs exceeding 400 bp were ligated into the PSPORT plasmid (Life Technologies). Recombinant plasmids were transformed into DH5a competent cells (Life Technologies).

[0184] LUNGFET03, PROSNOT16

[0185] The LUNGFET03 cDNA library was constructed using RNA isolated from lung tissue removed from a Caucasian female fetus who died at 20 weeks' gestation. The PROSNOT16 cDNA library was constructed using RNA isolated from diseased prostate tissue removed from a 68-year-old Caucasian male during a radical prostatectomy. Pathology indicated adenofibromatous hyperplasia. Pathology for the associated tumor tissue indicated adenocarcinoma (Gleason grade 3-4). The patient presented with elevated prostate specific antigen (PSA). The patient was concurrently diagnosed with myasthenia gravis. Patient history included osteoarthritis and type II diabetes. Family history included benign hypertension, acute myocardial infarction, hyperlipidemia, and arteriosclerotic coronary artery disease.

[0186] Frozen tissue from each of the above sources was homogenized and lysed in guanidinium isothiocyanate solution using a POLYTRON PT-3000 homogenizer (Brinkmann Instruments). The lysate was centrifuged over a CsCl cushion to isolate RNA. The RNA was extracted with acid phenol, precipitated with sodium acetate and ethanol, resuspended in RNase-free water, and treated with DNase. The RNA was re-extracted with acid phenol and reprecipitated as described above. Poly(A+) RNA was isolated using the OLIGOTEX mRNA purification kit (QIAGEN).

[0187] Poly(A+) RNA was used for cDNA synthesis and construction of the cDNA library according to the recommended protocols in the SUPERSCRIPT plasmid system (Life Technologies). The cDNAs were fractionated on a SEPHAROSE CL4B column (Amersham Pharmacia Biotech), and those cDNAs exceeding 400 bp were ligated into pINCY (Incyte Pharmaceuticals, Palo Alto Calif.). Recombinant plasmids were transformed into DH5a competent cells (Life Technologies).

[0188] II. Isolation of cDNA Clones

[0189] For each of the above cDNA libraries, plasmid DNA was released from host cells and purified using the R. E. A. L. PREP 96 plasmid kit (QIAGEN). The recommended protocol was employed except for the following changes: 1) the bacteria were cultured in 1 ml of sterile Terrific Broth (Life Technologies) with carbenicillin at 25 mg/l and glycerol at 0.4%; 2) after the cultures were incubated for 19 hours, the cells were lysed with 0.3 ml of lysis buffer; and 3) following isopropanol precipitation, the plasmid DNA pellets were each resuspended in 0.1 ml of distilled water. The DNA samples were stored at 4° C.

[0190] III. Sequencing and Analysis

[0191] The cDNAs were prepared for sequencing using the ABI CATALYST 800 (Perkin-Elmer) or the HYDRA microdispenser (Robbins Scientific) or MICROLAB 2200 (Hamilton) systems in combination with the PTC-200 thermal cyclers (MJ Research). The cDNAs were sequenced using the ABI PRISM 373 or 377 sequencing systems (Perkin-Elmer) and standard ABI protocols, base calling software, and kits. In one alternative, cDNAs were sequenced using the MEGABACE 1000 DNA sequencing system (Molecular Dynamics). In another alternative, the cDNAs were amplified and sequenced using the ABI PRISM BIGDYE terminator cycle sequencing ready reaction kit (Perkin-Elmer). In yet another alternative, cDNAs were sequenced using solutions and dyes from Amersham Pharmacia Biotech. Reading frames for the ESTs were determined using standard methods (reviewed in Ausubel, 1997, supra, unit 7.7). Some of the cDNA sequences were selected for extension using the techniques disclosed in Example V.

[0192] The polynucleotide sequences derived from cDNA, extension, and shotgun sequencing were assembled and analyzed using a combination of software programs which utilize algorithms well known to those skilled in the art. Table 1 summarizes the software programs, descriptions, references, and threshold parameters used. The first column of Table 1 shows the tools, programs, and algorithms used, the second column provides a brief description thereof, the third column presents the references which are incorporated by reference herein, and the fourth column presents, where applicable, the scores, probability values, and other parameters used to evaluate the strength of a match between two sequences (the higher the probability the greater the homology). Sequences were analyzed using MACDNASIS PRO software (Hitachi Software Engineering, South San Francisco Calif.) and LASERGENE software (DNASTAR).

[0193] The polynucleotide sequences were validated by removing vector, linker, and polyA sequences and by masking ambiguous bases, using algorithms and programs based on BLAST, dynamic programing, and dinucleotide nearest neighbor analysis. The sequences were then queried against a selection of public databases such as GenBank primate, rodent, mammalian, vertebrate, and eukaryote databases, and BLOCKS to acquire annotation, using programs based on BLAST, FASTA, and BLIMPS. The sequences were assembled into full length polynucleotide sequences using programs based on Phred, Phrap, and Consed, and were screened for open reading frames using programs based on GeneMark, BLAST, and FASTA. The full length polynucleotide sequences were translated to derive the corresponding full length amino acid sequences, and these full length sequences were subsequently analyzed by querying against databases such as the GenBank databases (described above), SwissProt, BLOCKS, PRINTS, Prosite, and Hidden Markov Model (HMM)-based protein family databases such as PFAM. HMM is a probalistic approach which analyzes consensus primary structures of gene families. (See, e.g., Eddy, S. R. (1996) Cur. Opin. Str. Biol. 6:361-365.) The programs described above for the assembly and analysis of full length polynucleotide and amino acid sequences were also used to identify polynucleotide sequence fragments from SEQ ID NO:4-6. Fragments from about 20 to about 4000 nucleotides which are useful in hybridization and amplification technologies were described in The Invention section above.

[0194] IV. Northern Analysis

[0195] Northern analysis is a laboratory technique used to detect the presence of a transcript of a gene and involves the hybridization of a labeled nucleotide sequence to a membrane on which RNAs from a particular cell type or tissue have been bound. (See, e.g., Sambrook, supra, ch. 7; Ausubel, 1995, supra, ch. 4 and 16.)

[0196] Analogous computer techniques applying BLAST were used to search for identical or related molecules in nucleotide databases such as GenBank or LIFESEQ database (Incyte Pharmaceuticals). This analysis is much faster than multiple membrane-based hybridizations. In addition, the sensitivity of the computer search can be modified to determine whether any particular match is categorized as exact or similar. The basis of the search is the product score, which is defined as: $\frac{\% \quad {sequence}\quad {identity} \times \% \quad {maximum}\quad {BLAST}\quad {score}}{100}$

[0197] % sequence identity x % maximum BLAST score 100

[0198] The product score takes into account both the degree of similarity between two sequences and the length of the sequence match. For example, with a product score of 40, the match will be exact within a 1% to 2% error, and, with a product score of 70, the match will be exact. Similar molecules are usually identified by selecting those which show product scores between 15 and 40, although lower scores may identify related molecules.

[0199] The results of northern analyses are reported as a percentage distribution of libraries in which the transcript encoding RNABP occurred. Analysis involved the categorization of cDNA libraries by organ/tissue and disease. The organ/tissue categories included cardiovascular, dermatologic, developmental, endocrine, gastrointestinal, hematopoietic/immune, musculoskeletal, nervous, reproductive, and urologic. The disease/condition categories included cancer, inflammation/trauma, cell proliferation, neurological, and pooled. For each category, the number of libraries expressing the sequence of interest was counted and divided by the total number of libraries across all categories. Percentage values of tissue-specific and disease- or condition-specific expression are reported in The Invention section above.

[0200] V. Extension of RNABP Encoding Polynucleotides

[0201] The full length nucleic acid sequences of SEQ ID NO:4-6 were produced by extension of an appropriate fragment of the full length molecule using oligonucleotide primers designed from this fragment. One primer was synthesized to initiate 5′ extension of the known fragment, and the other primer, to initiate 3′ extension of the known fragment. The initial primers were designed using OLIGO 4.06 software (National Biosciences), or another appropriate program, to be about 22 to 30 nucleotides in length, to have a GC content of about 50% or more, and to anneal to the target sequence at temperatures of about 68° C. to about 72° C. Any stretch of nucleotides which would result in hairpin structures and primer-primer dimerizations was avoided.

[0202] Selected human cDNA libraries were used to extend the sequence. If more than one extension was necessary or desired, additional or nested sets of primers were designed.

[0203] High fidelity amplification was obtained by PCR using methods well known in the art. PCR was performed in 96-well plates using the PTC-200 thermal cycler (MJ Research, Inc.). The reaction mix contained DNA template, 200 nmol of each primer, reaction buffer containing Mg²⁺, (NH₄)₂SO₄, and β-mercaptoethanol, Taq DNA polymerase (Amersham Pharmacia Biotech), ELONGASE enzyme (Life Technologies), and Pfu DNA polymerase (Stratagene), with the following parameters for primer pair PCI A and PCI B: Step 1: 94° C., 3 min; Step 2: 94° C., 15 sec; Step 3: 60° C., 1 min; Step 4: 68° C., 2 min; Step 5: Steps 2, 3, and 4 repeated 20 times; Step 6: 68° C., 5 min; Step 7: storage at 4° C. In the alternative, the parameters for primer pair T7 and SK+were as follows: Step 1: 94° C., 3 min; Step 2: 94° C., 15 sec; Step 3: 57° C., 1 min; Step 4: 68° C., 2 min; Step 5: Steps 2, 3, and 4 repeated 20 times; Step 6: 68° C., 5 min; Step 7: storage at 4° C.

[0204] The concentration of DNA in each well was determined by dispensing 100 μl PICOGREEN quantitation reagent (0.25% (v/v) PICOGREEN; Molecular Probes, Eugene Oreg.) dissolved in 1×TE and 0.5 μl of undiluted PCR product into each well of an opaque fluorimeter plate (Corning Costar, Acton Mass.), allowing the DNA to bind to the reagent. The plate was scanned in a FLUOROSKAN II microplate reader (Labsystems Oy, Helsinki, Finland) to measure the fluorescence of the sample and to quantify the concentration of DNA. A 5 μl to 10 μl aliquot of the reaction mixture was analyzed by electrophoresis on a 1% agarose mini-gel to determine which reactions were successful in extending the sequence.

[0205] The extended nucleotides were desalted and concentrated, transferred to 384-well plates, digested with CviJI cholera virus endonuclease (Molecular Biology Research, Madison Wis.), and sonicated or sheared prior to religation into PUC 18 vector (Amersham Pharmacia Biotech). For shotgun sequencing, the digested nucleotides were separated on low concentration (0.6 to 0.8%) agarose gels, fragments were excised, and agar digested with AGARACE enzyme (Promega). Extended clones were religated using T4 ligase (New England Biolabs, Beverly Mass.) into PUC 18 vector (Amersham Pharmacia Biotech), treated with Pfu DNA polymerase (Stratagene) to fill-in restriction site overhangs, and transfected into competent E. coli cells. Transformed cells were selected on antibiotic-containing media, individual colonies were picked and cultured overnight at 37° C. in 384-well plates in LB/2x carb liquid media.

[0206] The cells were lysed, and DNA was amplified by PCR using Taq DNA polymerase (Amersham Pharmacia Biotech) and Pfu DNA polymerase (Stratagene) with the following parameters: Step 1: 94° C., 3 min; Step 2: 94° C., 15 sec; Step 3: 60° C., 1 min; Step 4: 72° C., 2 min; Step 5: steps 2, 3, and 4 repeated 29 times; Step 6: 72° C., 5 min; Step 7: storage at 4° C. DNA was quantified by PICOGREEN reagent (Molecular Probes) as described above. Samples with low DNA recoveries were reamplified using the same conditions as described above. Samples were diluted with 20% dimethysulphoxide (1:2, v/v), and sequenced using DYENAMIC energy transfer sequencing primers and the DYENAMIC DIRECT kit (Amersham Pharmacia Biotech) or the ABI PRISM BIGDYE terminator cycle sequencing ready reaction kit (Perkin-Elmer).

[0207] In like manner, the nucleotide sequences of SEQ ID NO:4-6 are used to obtain 5′ regulatory sequences using the procedure above, oligonucleotides designed for such extension, and an appropriate genomic library.

[0208] VI. Labeling and Use of Individual Hybridization Probes

[0209] Hybridization probes derived from SEQ ID NO:4-6 are employed to screen cDNAs, genomic DNAs, or mRNAs. Although the labeling of oligonucleotides, consisting of about 20 base pairs, is specifically described, essentially the same procedure is used with larger nucleotide fragments. Oligonucleotides are designed using state-of-the-art software such as OLIGO 4.06 software (National Biosciences) and labeled by combining 50 pmol of each oligomer, 250 μCi of [y_³²P] adenosine triphosphate (Amersham Pharmacia Biotech), and T4 polynucleotide kinase (DuPont NEN, Boston Mass.). The labeled oligonucleotides are substantially purified using a SEPHADEX G-25 superfine size exclusion dextran bead column (Amersham Pharmacia Biotech). An aliquot containing 10⁷ counts per minute of the labeled probe is used in a typical membrane-based hybridization analysis of human genomic DNA digested with one of the following endonucleases: Ase I, Bgl II, Eco RI, Pst I, Xba I, or Pvu II (DuPont NEN).

[0210] The DNA from each digest is fractionated on a 0.7% agarose gel and transferred to nylon membranes (NYTRAN PLUS, Schleicher & Schuell, Durham N.H.). Hybridization is carried out for 16 hours at 40° C. To remove nonspecific signals, blots are sequentially washed at room temperature under increasingly stringent conditions up to 0.1×saline sodium citrate and 0.5% sodium dodecyl sulfate. After XOMAT-AR film (Eastman Kodak, Rochester N.Y.) is exposed to the blots, hybridization patterns are compared visually.

[0211] VII. Microarrays

[0212] A chemical coupling procedure and an ink jet device can be used to synthesize array elements on the surface of a substrate. (See, e.g., Baldeschweiler, supra.) An array analogous to a dot or slot blot may also be used to arrange and link elements to the surface of a substrate using thermal, UV, chemical, or mechanical bonding procedures. A typical array may be produced by hand or using available methods and machines and contain any appropriate number of elements. After hybridization, nonhybridized probes are removed and a scanner used to determine the levels and patterns of fluorescence. The degree of complementarity and the relative abundance of each probe which hybridizes to an element on the microarray may be assessed through analysis of the scanned images.

[0213] Full-length cDNAs, Expressed Sequence Tags (ESTs), or fragments thereof may comprise the elements of the microarray. Fragments suitable for hybridization can be selected using software well known in the art such as LASERGENE software (DNASTAR). Full-length cDNAs, ESTs, or fragments thereof corresponding to one of the nucleotide sequences of the present invention, or selected at random from a cDNA library relevant to the present invention, are arranged on an appropriate substrate, e.g., a glass slide. The cDNA is fixed to the slide using, e.g., UV cross-linking followed by thermal and chemical treatments and subsequent drying. (See, e.g., Schena, M. et al. (1995) Science 270:467-470; Shalon, D. et al. (1996) Genome Res. 6:639-645.) Fluorescent probes are prepared and used for hybridization to the elements on the substrate. The substrate is analyzed by procedures described above.

[0214] VIII. Complementary Polynucleotides

[0215] Sequences complementary to the RNABP-encoding sequences, or any parts thereof, are used to detect, decrease, or inhibit expression of naturally occurring RNABP. Although use of oligonucleotides comprising from about 15 to 30 base pairs is described, essentially the same procedure is used with smaller or with larger sequence fragments. Appropriate oligonucleotides are designed using OLIGO 4.06 software (National Biosciences) and the coding sequence of RNABP. To inhibit transcription, a complementary oligonucleotide is designed from the most unique 5′ sequence and used to prevent promoter binding to the coding sequence. To inhibit translation, a complementary oligonucleotide is designed to prevent ribosomal binding to the RNABP-encoding transcript.

[0216] IX. Expression of RNABP

[0217] Expression and purification of RNABP is achieved using bacterial or virus-based expression systems. For expression of RNABP in bacteria, cDNA is subcloned into an appropriate vector containing an antibiotic resistance gene and an inducible promoter that directs high levels of cDNA transcription. Examples of such promoters include, but are not limited to, the trp-lac (tac) hybrid promoter and the T5 or T7 bacteriophage promoter in conjunction with the lac operator regulatory element. Recombinant vectors are transformed into suitable bacterial hosts, e.g., BL21(DE3). Antibiotic resistant bacteria express RNABP upon induction with isopropyl beta-D-thiogalactopyranoside (IPTG). Expression of RNABP in eukaryotic cells is achieved by infecting insect or mammalian cell lines with recombinant Autographica californica nuclear polyhedrosis virus (AcMNPV), commonly known as baculovirus. The nonessential polyhedrin gene of baculovirus is replaced with cDNA encoding RNABP by either homologous recombination or bacterial-mediated transposition involving transfer plasmid intermediates. Viral infectivity is maintained and the strong polyhedrin promoter drives high levels of cDNA transcription. Recombinant baculovirus is used to infect Spodoptera frugiperda (Sf9) insect cells in most cases, or human hepatocytes, in some cases. Infection of the latter requires additional genetic modifications to baculovirus. (See Engelhard, E. K. et al. (1994) Proc. Natl. Acad. Sci. USA 91:3224-3227; Sandig, V. et al. (1996) Hum. Gene Ther. 7:1937-1945.)

[0218] In most expression systems, RNABP is synthesized as a fusion protein with, e.g., glutathione S-transferase (GST) or a peptide epitope tag, such as the FLAG epitope (Sigma-Aldrich) or 6-His, permitting rapid, single-step, affinity-based purification of recombinant fusion protein from crude cell lysates. GST, a 26-kilodalton enzyme from Schistosoma japonicum, enables the purification of fusion proteins on immobilized glutathione under conditions that maintain protein activity and antigenicity (Amersham Pharmacia Biotech). Following purification, the GST moiety can be proteolytically cleaved from RNABP at specifically engineered sites. The FLAG epitope (Sigma-Aldrich), an 8-amino acid peptide, enables immunoaffinity purification using commercially available monoclonal and polyclonal anti-FLAG antibodies (Eastman Kodak). 6-His, a stretch of six consecutive histidine residues, enables purification on metal-chelate resins (QIAGEN). Methods for protein expression and purification are discussed in Ausubel (1995, supra, ch 10 and 16). Purified RNABP obtained by these methods can be used directly in the following activity assay.

[0219] X. Demonstration of RNABP Activity

[0220] RNABP activity is demonstrated by the formation of an RNABP-RNA complex as detected by polyacrylamide gel mobility-shift assay. In preparation for this assay, RNABP is expressed by transforming a mammalian cell line such as COS7, HeLa or CHO with a eukaryotic expression vector containing RNABP cDNA. The cells are incubated for 48-72 hours after transformation under conditions which allow expression and accumulation of RNABP. Extracts containing solubilized proteins can be prepared from cells expressing RNABP by methods well known in the art. Portions of the extract containing RNABP are added to [³²P]-labeled RNA. Radioactive RNA can be synthesized in vitro by techniques well known in the art. The mixtures are incubated at 25° C. in the presence of RNase inhibitors under buffered conditions for 5-10 minutes. After incubation, the samples are analyzed by polyacrylamide gel electrophoresis followed by autoradiography. The presence of a high molecular weight band on the autoradiogram indicates the formation of a complex between RNABP and the radioactive transcript. A band of significantly lower molecular weight will be present in samples prepared using control extracts prepared from untransformed cells. The amount of RNABP-RNA complex can be quantified using phospho-image analysis and is proportional to the activity of RNABP.

[0221] XI. Functional Assays

[0222] RNABP function is assessed by expressing the sequences encoding RNABP at physiologically elevated levels in mammalian cell culture systems. cDNA is subcloned into a mammalian expression vector containing a strong promoter that drives high levels of cDNA expression. Vectors of choice include the PCMV SPORT plasmid (Life Technologies) and the PCR3.1 plasmid (Invitrogen, Carlsbad Calif.), both of which contain the cytomegalovirus promoter. 5-10 μg of recombinant vector are transiently transfected into a human cell line, preferably of endothelial or hematopoietic origin, using either liposome formulations or electroporation. 1-2 μg of an additional plasmid containing sequences encoding a marker protein are co-transfected. Expression of a marker protein provides a means to distinguish transfected cells from nontransfected cells and is a reliable predictor of cDNA expression from the recombinant vector. Marker proteins of choice include, e.g., Green Fluorescent Protein (GFP; Clontech), CD64, or a CD64-GFP fusion protein. Flow cytometry (FCM), an automated, laser optics-based technique, is used to identify transfected cells expressing GFP or CD64-GFP, and to evaluate properties, for example, their apoptotic state. FCM detects and quantifies the uptake of fluorescent molecules that diagnose events preceding or coincident with cell death. These events include changes in nuclear DNA content as measured by staining of DNA with propidium iodide; changes in cell size and granularity as measured by forward light scatter and 90 degree side light scatter; down-regulation of DNA synthesis as measured by decrease in bromodeoxyuridine uptake; alterations in expression of cell surface and intracellular proteins as measured by reactivity with specific antibodies; and alterations in plasma membrane composition as measured by the binding of fluorescein-conjugated Annexin V protein to the cell surface. Methods in flow cytometry are discussed in Ormerod, M. G. (1994) Flow Cytometry, Oxford, New York N.Y.

[0223] The influence of RNABP on gene expression can be assessed using highly purified populations of cells transfected with sequences encoding RNABP and either CD64 or CD64-GFP. CD64 and CD64-GFP are expressed on the surface of transfected cells and bind to conserved regions of human immunoglobulin G (IgG). Transfected cells are efficiently separated from nontransfected cells using magnetic beads coated with either human IgG or antibody against CD64 (DYNAL, Lake Success N.Y.). mRNA can be purified from the cells using methods well known by those of skill in the art. Expression of mRNA encoding RNABP and other genes of interest can be analyzed by northern analysis or microarray techniques.

[0224] XII. Production of RNABP Specific Antibodies

[0225] RNABP substantially purified using polyacrylamide gel electrophoresis (PAGE; see, e.g., Harrington, M. G. (1990) Methods Enzymol. 182:488-495), or other purification techniques, is used to immunize rabbits and to produce antibodies using standard protocols.

[0226] Alternatively, the RNABP amino acid sequence is analyzed using LASERGENE software (DNASTAR) to determine regions of high immunogenicity, and a corresponding oligopeptide is synthesized and used to raise antibodies by means known to those of skill in the art. Methods for selection of appropriate epitopes, such as those near the C-terminus or in hydrophilic regions are well described in the art. (See, e.g., Ausubel, 1995, supra, ch. 11.)

[0227] Typically, oligopeptides 15 residues in length are synthesized using an ABI 431A peptide synthesizer (Perkin-Elmer) using fmoc-chemistry and coupled to KLH (Sigma-Aldrich) by reaction with N-maleimidobenzoyl-N-hydroxysuccinimide ester (MBS) to increase immunogenicity. (See, e.g., Ausubel, 1995, supra.) Rabbits are immunized with the oligopeptide-KLH complex in complete Freund's adjuvant. Resulting antisera are tested for antipeptide activity by, for example, binding the peptide to plastic, blocking with 1% BSA, reacting with rabbit antisera, washing, and reacting with radio-iodinated goat anti-rabbit IgG.

[0228] XIII. Purification of Naturally Occurring RNABP Using Specific Antibodies

[0229] Naturally occurring or recombinant RNABP is substantially purified by immunoaffinity chromatography using antibodies specific for RNABP. An immunoaffinity column is constructed by covalently coupling anti-RNABP antibody to an activated chromatographic resin, such as CNBr-activated SEPHAROSE (Amersham Pharmacia Biotech). After the coupling, the resin is blocked and washed according to the manufacturer's instructions.

[0230] Media containing RNABP are passed over the immunoaffinity column, and the column is washed under conditions that allow the preferential absorbance of RNABP (e.g., high ionic strength buffers in the presence of detergent). The column is eluted under conditions that disrupt antibody/RNABP binding (e.g., a buffer of pH 2 to pH 3, or a high concentration of a chaotrope, such as urea or thiocyanate ion), and RNABP is collected.

[0231] XIV. Identification of Molecules Which Interact with RNABP

[0232] RNABP, or biologically active fragments thereof, are labeled with ¹²⁵I Bolton-Hunter reagent. (See, e.g., Bolton et al. (1973) Biochem. J. 133:529.) Candidate molecules previously arrayed in the wells of a multi-well plate are incubated with the labeled RNABP, washed, and any wells with labeled RNABP complex are assayed. Data obtained using different concentrations of RNABP are used to calculate values for the number, affinity, and association of RNABP with the candidate molecules.

[0233] Various modifications and variations of the described methods and systems of the invention will be apparent to those skilled in the art without departing from the scope and spirit of the invention. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention which are obvious to those skilled in molecular biology or related fields are intended to be within the scope of the following claims.

1 9 1 547 PRT Homo sapiens 1229372 1 Met Glu Asp Ser Glu Ala Leu Gly Phe Glu His Met Gly Leu Asp 1 5 10 15 Pro Arg Leu Leu Gln Ala Val Thr Asp Leu Gly Trp Ser Arg Pro 20 25 30 Thr Leu Ile Gln Glu Lys Ala Ile Pro Leu Ala Leu Glu Gly Lys 35 40 45 Asp Leu Leu Ala Arg Ala Arg Thr Gly Ser Gly Lys Thr Ala Ala 50 55 60 Tyr Ala Ile Pro Met Leu Gln Leu Leu Leu His Arg Lys Ala Thr 65 70 75 Gly Pro Val Val Glu Gln Ala Val Arg Gly Leu Val Leu Val Pro 80 85 90 Thr Lys Glu Leu Ala Arg Gln Ala Gln Ser Met Ile Gln Gln Leu 95 100 105 Ala Thr Tyr Cys Ala Arg Asp Val Arg Val Ala Asn Val Ser Ala 110 115 120 Ala Glu Asp Ser Val Ser Gln Arg Ala Val Leu Met Glu Lys Pro 125 130 135 Asp Val Val Val Gly Thr Pro Ser Arg Ile Leu Ser His Leu Gln 140 145 150 Gln Asp Ser Leu Lys Leu Arg Asp Ser Leu Glu Leu Leu Val Val 155 160 165 Asp Glu Ala Asp Leu Leu Phe Ser Phe Gly Phe Glu Glu Glu Leu 170 175 180 Lys Ser Leu Leu Cys His Leu Pro Arg Ile Tyr Gln Ala Phe Leu 185 190 195 Met Ser Ala Thr Phe Asn Glu Asp Val Gln Ala Leu Lys Glu Leu 200 205 210 Ile Leu His Asn Pro Val Thr Leu Lys Leu Gln Glu Ser Gln Leu 215 220 225 Pro Gly Pro Asp Gln Leu Gln Gln Phe Gln Val Val Cys Glu Thr 230 235 240 Glu Glu Asp Lys Phe Leu Leu Leu Tyr Ala Leu Leu Lys Leu Ser 245 250 255 Leu Ile Arg Gly Lys Ser Leu Leu Phe Val Asn Thr Leu Glu Arg 260 265 270 Ser Tyr Arg Leu Arg Leu Phe Leu Glu Gln Phe Ser Ile Pro Thr 275 280 285 Cys Val Leu Asn Gly Glu Leu Pro Leu Arg Ser Arg Cys His Ile 290 295 300 Ile Ser Gln Phe Asn Gln Gly Phe Tyr Asp Cys Val Ile Ala Thr 305 310 315 Asp Ala Glu Val Leu Gly Ala Pro Val Lys Gly Lys Arg Arg Gly 320 325 330 Arg Gly Pro Lys Gly Asp Lys Ala Ser Asp Pro Glu Ala Gly Val 335 340 345 Ala Arg Gly Ile Asp Phe His His Val Ser Ala Val Leu Asn Phe 350 355 360 Asp Leu Pro Pro Thr Pro Glu Ala Tyr Ile His Arg Ala Gly Arg 365 370 375 Thr Ala Arg Ala Asn Asn Pro Gly Ile Val Leu Thr Phe Val Leu 380 385 390 Pro Thr Glu Gln Phe His Leu Gly Lys Ile Glu Glu Leu Leu Ser 395 400 405 Gly Glu Asn Arg Gly Pro Ile Leu Leu Pro Tyr Gln Phe Arg Met 410 415 420 Glu Glu Ile Glu Gly Phe Arg Tyr Arg Cys Arg Asp Ala Met Arg 425 430 435 Ser Val Thr Lys Gln Ala Ile Arg Glu Ala Arg Leu Lys Glu Ile 440 445 450 Lys Glu Glu Leu Leu His Ser Glu Lys Leu Lys Thr Tyr Phe Glu 455 460 465 Asp Asn Pro Arg Asp Leu Gln Leu Leu Arg His Asp Leu Pro Leu 470 475 480 His Pro Ala Val Val Lys Pro His Leu Gly His Val Pro Asp Tyr 485 490 495 Leu Val Pro Pro Ala Leu Arg Gly Leu Val Arg Pro His Lys Lys 500 505 510 Arg Lys Lys Leu Ser Ser Ser Cys Arg Lys Ala Lys Arg Ala Lys 515 520 525 Ser Gln Asn Pro Leu Arg Ser Phe Lys His Lys Gly Lys Lys Phe 530 535 540 Arg Pro Thr Ala Lys Pro Ser 545 2 366 PRT Homo sapiens 1250374 2 Met Glu Lys Lys Lys Met Val Thr Gln Gly Asn Gln Glu Pro Thr 1 5 10 15 Thr Thr Pro Asp Ala Met Val Gln Pro Phe Thr Thr Ile Pro Phe 20 25 30 Pro Pro Pro Pro Gln Asn Gly Ile Pro Thr Glu Tyr Gly Val Pro 35 40 45 His Thr Gln Asp Tyr Ala Gly Gln Thr Gly Glu His Asn Leu Thr 50 55 60 Leu Tyr Gly Ser Thr Gln Ala His Gly Glu Gln Ser Ser Asn Ser 65 70 75 Pro Ser Thr Gln Asn Gly Ser Leu Thr Thr Glu Gly Gly Ala Gln 80 85 90 Thr Asp Gly Gln Gln Ser Gln Thr Gln Ser Ser Glu Asn Ser Glu 95 100 105 Ser Lys Ser Thr Pro Lys Arg Leu His Val Ser Asn Ile Pro Phe 110 115 120 Arg Phe Arg Asp Pro Asp Leu Arg Gln Met Phe Gly Gln Phe Gly 125 130 135 Lys Ile Leu Asp Val Glu Ile Ile Phe Asn Glu Arg Gly Ser Lys 140 145 150 Gly Phe Gly Phe Val Thr Phe Glu Asn Ser Ala Asp Ala Asp Arg 155 160 165 Ala Arg Glu Lys Leu His Gly Thr Val Val Glu Gly Arg Lys Ile 170 175 180 Glu Val Asn Asn Ala Thr Ala Arg Val Met Thr Asn Lys Lys Met 185 190 195 Val Thr Pro Tyr Ala Asn Gly Trp Lys Leu Ser Pro Val Val Gly 200 205 210 Ala Val Tyr Gly Pro Glu Leu Tyr Ala Ala Ser Ser Phe Gln Ala 215 220 225 Asp Val Ser Leu Gly Asn Asp Ala Ala Val Pro Leu Ser Gly Arg 230 235 240 Gly Gly Ile Asn Thr Tyr Ile Pro Leu Ile Ile Pro Gly Phe Pro 245 250 255 Tyr Pro Thr Ala Ala Thr Thr Ala Ala Ala Phe Arg Gly Ala His 260 265 270 Leu Arg Gly Arg Gly Arg Thr Val Tyr Gly Ala Val Arg Ala Val 275 280 285 Pro Pro Thr Ala Ile Pro Ala Tyr Pro Gly Val Asp Met Gln Pro 290 295 300 Thr Asp Met His Ser Leu Leu Leu Gln Pro Gln Pro Pro Leu Leu 305 310 315 Gln Pro Leu Gln Pro Leu Thr Val Thr Val Met Ala Gly Cys Thr 320 325 330 Gln Pro Thr Pro Thr Met Pro Leu Pro Leu Pro Leu Ala Met Glu 335 340 345 Leu Ala Leu Trp Arg Val Tyr Thr Glu Val Ala Thr Ala Asp Leu 350 355 360 Pro Pro Thr Glu Val Thr 365 3 226 PRT Homo sapiens 1710966 3 Met Ala Gly Leu Val Val Arg Gly Thr Gln Val Ser Tyr Ile Gly 1 5 10 15 Gln Asp Cys Arg Glu Ile Pro Glu His Leu Gly Arg Asp Cys Gly 20 25 30 His Phe Ala Lys Arg Leu Asp Leu Ser Phe Asn Leu Leu Arg Ser 35 40 45 Leu Glu Gly Leu Ser Ala Phe Arg Ser Leu Glu Glu Leu Ile Leu 50 55 60 Asp Asn Asn Gln Leu Gly Asp Asp Leu Val Leu Pro Gly Leu Pro 65 70 75 Arg Leu His Thr Leu Thr Leu Asn Lys Asn Arg Ile Thr Asp Leu 80 85 90 Glu Asn Leu Leu Asp His Leu Ala Glu Val Thr Pro Ala Leu Glu 95 100 105 Tyr Leu Ser Leu Leu Gly Asn Val Ala Cys Pro Asn Glu Leu Val 110 115 120 Ser Leu Glu Lys Asp Glu Glu Asp Tyr Lys Arg Tyr Arg Cys Phe 125 130 135 Val Leu Tyr Lys Leu Pro Asn Leu Lys Phe Leu Asp Ala Gln Lys 140 145 150 Val Thr Arg Gln Glu Arg Glu Glu Ala Leu Val Arg Gly Val Phe 155 160 165 Met Lys Val Val Lys Pro Lys Ala Ser Ser Glu Asp Val Ala Ser 170 175 180 Ser Pro Glu Arg His Tyr Thr Pro Leu Pro Ser Ala Ser Arg Glu 185 190 195 Leu Thr Ser His Gln Gly Val Leu Gly Lys Cys Arg Tyr Val Tyr 200 205 210 Tyr Gly Lys Asn Ser Glu Gly Asn Arg Phe Ile Arg Asp Asp Gln 215 220 225 Leu 4 2286 DNA Homo sapiens 1229372 4 ggttctcctc agcccagtct atctcagtgg ctccattcat agggtgatgt gcccggcggg 60 acactaaccc taaccaagca gagagacggt catgcccgtc acgacctcgg ccctcgcccc 120 ggccgaggct tctcctgcag gtcgcgagaa tcaggtgcgt cacggcgtcc gggaacgccg 180 gaagagccag tggagcggct ctgtagtcca aagtaccccg tcgaccccag cacggccgct 240 ccaccgcctc ctactagacc cagtcctagg gactgcgcag tcgcagagct ccgtccgagt 300 accggaagcc taggccgcca gcacttccgg gaagtgactt cgtctccgaa gccgattggt 360 tgttgctttg ctcccgctcg cgtcggtggc gtttttcctg cagcgcgtgc gtgctgcgct 420 actgagcagc gccatggagg actctgaagc actgggcttc gaacacatgg gcctcgatcc 480 ccggctcctt caggctgtca ccgatctggg ctggtcgcga cctacgctga tccaggagaa 540 ggccatccca ctggccctag aagggaagga cctcctggct cgggcccgca cgggctccgg 600 gaagacggcc gcttatgcta ttccgatgct gcagctgttg ctccatagga aggcgacagg 660 tccggtggta gaacaggcag tgagaggcct tgttcttgtt cctaccaagg agctggcacg 720 gcaagcacag tccatgattc agcagctggc tacctactgt gctcgggatg tccgagtggc 780 caatgtctca gctgctgaag actcagtctc tcagagagct gtgctgatgg agaagccaga 840 tgtggtagta gggaccccat ctcgcatatt aagccacttg cagcaagaca gcctgaaact 900 tcgtgactcc ctggagcttt tggtggtgga cgaagctgac cttctttttt cctttggctt 960 tgaagaagag ctcaagagtc tcctctgtca cttgccccgg atttaccagg cttttctcat 1020 gtcagctact tttaacgagg acgtacaagc actcaaggag ctgatattac ataacccggt 1080 tacccttaag ttacaggagt cccagctgcc tgggccagac cagttacagc agtttcaggt 1140 ggtctgtgag actgaggaag acaaattcct cctgctgtat gccctgctca agctgtcatt 1200 gattcggggc aagtctctgc tctttgtcaa cactctagaa cggagttacc ggctacgcct 1260 gttcttggaa cagttcagca tccccacctg tgtgctcaat ggagagcttc cactgcgctc 1320 caggtgccac atcatctcac agttcaacca aggcttctac gactgtgtca tagcaactga 1380 tgctgaagtc ctgggggccc cagtcaaggg caagcgtcgg ggccgagggc ccaaagggga 1440 caaggcctct gatccggaag caggtgtggc ccggggcata gacttccacc atgtgtctgc 1500 tgtgctcaac tttgatcttc ccccaacccc tgaggcctac atccatcgag ctggcaggac 1560 agcacgcgct aacaacccag gcatagtctt aacctttgtg cttcccacgg agcagttcca 1620 cttaggcaag attgaggagc ttctcagtgg agagaacagg ggccccattc tgctccccta 1680 ccagttccgg atggaggaga tcgagggctt ccgctatcgc tgcagggatg ccatgcgctc 1740 agtgactaag caggccattc gggaggcaag attgaaggag atcaaggaag agcttctgca 1800 ttctgagaag cttaagacat actttgaaga caaccctagg gacctccagc tgctgcggca 1860 tgacctacct ttgcaccccg cagtggtgaa gccccacctg ggccatgttc ctgactacct 1920 ggttcctcct gctctccgtg gcctggtgcg ccctcacaag aagcggaaga agctgtcttc 1980 ctcttgtagg aaggccaaga gagcaaagtc ccagaaccca ctgcgcagct tcaagcacaa 2040 aggaaagaaa ttcagaccca cagccaagcc ctcctgaggt tgttgggcct ctctggagct 2100 gagcacattg tggagcacag gcttacaccc ttcgtggaca ggcgaggctc tggtgcttac 2160 tgcacagcct gaacagacag ttctggggcc ggcagtgctg ggccctttag ctccttggca 2220 cttccaagct ggcatcttgc cccttgacaa cagaataaaa attttagctg ccccaaaaaa 2280 aaaaaa 2286 5 1506 DNA Homo sapiens 1250374 5 cggacgcgtg gctgccagag aggaagagaa aagaaaggaa gaaacattag aaagaaaaag 60 gaaggaaaac ggtataaaga gagatcaatt acccaccctt aaatagctag attggggggg 120 gaggggggtg gaaaagaaag ctgtggaggt gtgccccagc acggctgctt tgaaaggttt 180 atcatctatc cgtttggttt atggagaaaa agaaaatggt aactcagggt aaccaggagc 240 cgacaacaac tcctgacgca atggttcagc cttttactac catcccattt ccaccacctc 300 cgcagaatgg aattcccaca gagtatgggg tgccacacac tcaagactat gccggccaga 360 ccggtgagca taacctgaca ctctacggaa gtacgcaagc ccacggggag cagagcagca 420 actcacccag cacacaaaat ggatctctta cgacagaagg tggagcacag acagacggcc 480 agcagtcaca gacacaaagt agtgaaaatt cagagagtaa atctaccccg aaacggctgc 540 atgtctctaa tattcctttc cgcttccggg accctgacct ccggcagatg tttgggcagt 600 ttggcaaaat cctagatgta gaaataatct ttaatgaacg tggctctaag ggattcgggt 660 tcgtaacttt cgagaatagt gctgatgcag acagggccag ggagaaatta cacggcaccg 720 tggtagaggg ccgtaaaatc gaggtgaata atgctacagc acgtgtaatg accaataaga 780 agatggtcac accatatgca aatggttgga aattaagccc agtagttgga gctgtatatg 840 gtccggagtt atatgcagca tccagctttc aagcagatgt gtccctaggc aatgatgcag 900 cagtgcccct atcaggaaga gggggtatca acacttacat tcctttaatc attcctggct 960 tcccttaccc tactgcagcc accacggcag ccgctttcag aggagcccat ttgaggggca 1020 gagggcggac agtatatggt gcagtccgag cggtacctcc aacagccatc cccgcctatc 1080 caggggtgga tatgcagcct acagatatgc acagcctgct actgcaaccg cagccaccgc 1140 tgctgcagcc gctgcagccg cttacagtga cggttatggc agggtgtaca cagccgaccc 1200 ctaccatgcc cttgcccctg ccgctagcta tggagttggc gctgtggcga gtttataccg 1260 aggtggctac agccgatttg ccccctactg aagtgacgtg agacccctgc aaatgggaca 1320 gccccccagt tcatgaggcc tggctattgc aatatttact agtagaggaa ctctatagca 1380 agatgaagag gaaaaacaaa caaacaaaca aacaaaaaca caaaaaaaga aagaatactt 1440 ttttatacct cactatgttc tttgaatatg tatttttcct ttaaatttct gcctttaaaa 1500 aaaaaa 1506 6 834 DNA Homo sapiens 1710966 6 gccgcgctcc ccgctgctgc cgccgcgacc ccgcgctccg tcccgcgcgc ccgcagcgtc 60 ctggccgcca tggccgggct cgtggtgcgt ggaactcaag tgtcctacat aggccaggac 120 tgcagagaaa ttccagagca ccttggcagg gactgtggac atttcgcaaa gaggcttgat 180 ctgagcttta accttctgag gtcactggaa ggactgagcg cattcaggag cctggaggaa 240 ctcatcttgg acaacaatca gctgggggac gaccttgtgt tgccagggtt acccagactg 300 cataccttaa ccctcaacaa gaaccgaatc actgatttgg agaacctgct ggatcacttg 360 gcagaagtga caccagctct ggagtacctc agtctgctgg gcaacgtggc ctgtcccaac 420 gagctggtca gcctggaaaa ggatgaggaa gactacaaga gatacagatg ctttgttctg 480 tacaagctgc ccaacttgaa atttctggat gcccagaaag taaccagaca agaacgagag 540 gaggcgttgg tcagaggagt cttcatgaag gtggtgaagc ccaaggcttc tagtgaggac 600 gttgccagct ccccggagcg ccactacacg cccttgcctt ctgcttccag ggaactcacc 660 agtcaccaag gtgtcctggg gaagtgtcgc tacgtttact atgggaaaaa ctcagagggc 720 aacaggttta tccgagatga ccagctctga agccaacttc tgtatacctt cacccatttc 780 atgaaaataa aatcaaaagg gaaatcaaaa ataaagaaaa cgctaaaaaa aaaa 834 7 560 PRT Drosophila melanogaster g3378056 7 Met Ser Gln Met Thr Gln Lys Thr Val Gln Phe His Glu Leu Glu 1 5 10 15 Leu Asp Gln Arg Ile Leu Lys Ala Val Ala Gln Leu Gly Trp Gln 20 25 30 Gln Pro Thr Leu Ile Gln Ser Thr Ala Ile Pro Leu Leu Leu Glu 35 40 45 Gly Lys Asp Val Val Val Arg Ala Arg Thr Gly Ser Gly Lys Thr 50 55 60 Ala Thr Tyr Ala Leu Pro Leu Ile Gln Lys Ile Leu Asn Ser Lys 65 70 75 Leu Asn Ala Ser Glu Gln Tyr Val Ser Ala Val Val Leu Ala Pro 80 85 90 Thr Lys Glu Leu Cys Arg Gln Ser Arg Lys Val Ile Glu Gln Leu 95 100 105 Val Glu Ser Cys Gly Lys Val Val Arg Val Ala Asp Ile Ala Asp 110 115 120 Ser Ser Asn Asp Thr Val Thr Gln Arg His Ala Leu Ser Glu Ser 125 130 135 Pro Asp Ile Val Val Ala Thr Pro Ala Asn Leu Leu Ala Tyr Ala 140 145 150 Glu Ala Gly Ser Val Val Asp Leu Lys His Val Glu Thr Leu Val 155 160 165 Val Asp Glu Ala Asp Leu Val Phe Ala Tyr Gly Tyr Glu Lys Asp 170 175 180 Phe Lys Arg Leu Ile Lys His Leu Pro Pro Ile Tyr Gln Ala Val 185 190 195 Leu Val Ser Ala Thr Leu Thr Asp Asp Val Val Arg Met Lys Gly 200 205 210 Leu Cys Leu Asn Asn Pro Val Thr Leu Lys Leu Glu Glu Pro Glu 215 220 225 Leu Val Pro Gln Asp Gln Leu Ser His Gln Arg Ile Leu Ala Glu 230 235 240 Glu Asn Asp Lys Pro Ala Ile Leu Tyr Ala Leu Leu Lys Leu Arg 245 250 255 Leu Ile Arg Gly Lys Ser Ile Ile Phe Val Asn Ser Ile Asp Arg 260 265 270 Cys Tyr Lys Val Arg Leu Phe Leu Glu Gln Phe Gly Ile Arg Ala 275 280 285 Cys Val Leu Asn Ser Glu Leu Pro Ala Asn Ile Arg Ile His Thr 290 295 300 Ile Ser Gln Phe Asn Lys Gly Thr Tyr Asp Ile Ile Ile Ala Ser 305 310 315 Asp Glu His His Met Glu Lys Pro Gly Gly Lys Ser Ala Thr Asn 320 325 330 Arg Lys Ser Pro Arg Ser Gly Asp Met Glu Ser Ser Ala Ser Arg 335 340 345 Gly Ile Asp Phe Gln Cys Val Asn Asn Val Ile Asn Phe Asp Phe 350 355 360 Pro Arg Asp Val Thr Ser Tyr Ile His Arg Ala Gly Arg Thr Ala 365 370 375 Arg Gly Asn Asn Lys Gly Ser Val Leu Ser Phe Val Ser Met Lys 380 385 390 Glu Ser Lys Val Asn Asp Ser Val Glu Lys Lys Leu Cys Asp Ser 395 400 405 Phe Ala Ala Gln Glu Gly Glu Gln Ile Ile Lys Asn Tyr Gln Phe 410 415 420 Lys Met Glu Glu Val Glu Ser Phe Arg Tyr Arg Ala Gln Asp Cys 425 430 435 Trp Arg Ala Ala Thr Arg Val Ala Val His Asp Thr Arg Ile Arg 440 445 450 Glu Ile Lys Ile Glu Ile Leu Asn Cys Glu Lys Leu Lys Ala Phe 455 460 465 Phe Glu Glu Asn Lys Arg Asp Leu Gln Ala Leu Arg His Asp Lys 470 475 480 Pro Leu Arg Ala Ile Lys Val Gln Ser His Leu Ser Asp Met Pro 485 490 495 Glu Tyr Ile Val Pro Lys Ala Leu Lys Arg Val Val Gly Thr Ser 500 505 510 Ser Ser Pro Val Gly Ala Ser Glu Ala Lys Gln Pro Arg Gln Ser 515 520 525 Ala Ala Lys Ala Ala Phe Glu Arg Gln Val Asn Asp Pro Leu Met 530 535 540 Ala Ser Gln Val Asp Phe Gly Lys Arg Arg Pro Ala His Arg Arg 545 550 555 Lys Lys Lys Ala Leu 560 8 415 PRT Caenorhabditis elegans g608464 8 Met Gln Ala Leu Tyr Gln Leu Ser Ala Thr Gly Ala Gln Gln Gln 1 5 10 15 Asn Gln Gln Ile Pro Ile Gly Leu Ser Asn Ser Leu Leu Tyr Gln 20 25 30 Gln Leu Ala Ala His Gln Gln Ile Ala Ala Gln Gln His Gln Gln 35 40 45 Gln Leu Ala Val Ser Ala Ala His Gln Thr Gln Asn Asn Ile Met 50 55 60 Leu Ala Thr Ser Ala Pro Ser Leu Ile Asn His Met Glu Asn Ser 65 70 75 Thr Asp Gly Lys Val Lys Asp Asp Pro Asn Ser Asp Tyr Asp Leu 80 85 90 Gln Leu Ser Ile Gln Gln Arg Leu Ala Ala Ala Ala Gln Ala Ala 95 100 105 Gln Met Gly Gln Thr Gln Ile Gly Pro Gln Ile Val Gly Gln Gln 110 115 120 Gly Gln Pro Val Val Ala Thr Thr Ala Gly Ser Thr Asn Gly Ser 125 130 135 Ala Ala Val Thr Gln Pro Asp Pro Ser Thr Ser Ser Gly Pro Asp 140 145 150 Gly Pro Lys Arg Leu His Val Ser Asn Ile Pro Phe Arg Phe Arg 155 160 165 Asp Pro Asp Leu Lys Thr Met Phe Glu Lys Phe Gly Val Val Ser 170 175 180 Asp Val Glu Ile Ile Phe Asn Glu Arg Gly Ser Lys Gly Phe Gly 185 190 195 Phe Val Thr Met Glu Arg Pro Gln Asp Ala Glu Arg Ala Arg Gln 200 205 210 Glu Leu His Gly Ser Met Ile Glu Gly Arg Lys Ile Glu Val Asn 215 220 225 Cys Ala Thr Ala Arg Val His Ser Lys Lys Val Lys Pro Thr Gly 230 235 240 Gly Ile Leu Asp Gln Met Asn Pro Leu Met Ala Gln Ser Ala Leu 245 250 255 Ala Ala Gln Ala Gln Met Asn Arg Ala Leu Leu Leu Arg Ser Pro 260 265 270 Leu Val Ala Gln Ser Leu Leu Gly Arg Gly Pro Ala Leu Ile Pro 275 280 285 Gly Met Gln Gln Pro Ala Phe Gln Leu Gln Ala Ala Leu Ala Gly 290 295 300 Asn Pro Leu Ala Gln Leu Gln Gly Gln Pro Leu Leu Phe Asn Ala 305 310 315 Ala Ala Leu Gln Thr Asn Ala Leu Gln Gln Ser Ala Phe Gly Met 320 325 330 Asp Pro Ala Ala Val Leu Ala Ala Leu Leu Ala Asn Glu Gln Ala 335 340 345 Arg Phe Gln Leu Ala Ala Ala Ala Ala Gln Gly Asn Glu Tyr Ile 350 355 360 Met Tyr His Gln Ala Lys Gln Gln Glu Leu Pro Gly Arg Ile Pro 365 370 375 Ser Ser Gly Asn Ala Ser Ala Phe Gly Glu Gln Tyr Leu Ser Asn 380 385 390 Ala Leu Ala Thr Ala Ser Leu Pro Ser Tyr Gln Met Asn Pro Ala 395 400 405 Leu Arg Thr Leu Asn Arg Phe Thr Pro Tyr 410 415 9 255 PRT Homo sapiens g37547 9 Met Val Lys Leu Thr Ala Glu Leu Ile Glu Gln Ala Ala Gln Tyr 1 5 10 15 Thr Asn Ala Val Arg Asp Arg Glu Leu Asp Leu Arg Gly Tyr Lys 20 25 30 Ile Pro Val Ile Glu Asn Leu Gly Ala Thr Leu Asp Gln Phe Asp 35 40 45 Ala Ile Asp Phe Ser Asp Asn Glu Ile Arg Lys Leu Asp Gly Phe 50 55 60 Pro Leu Leu Arg Arg Leu Lys Thr Leu Leu Val Asn Asn Asn Arg 65 70 75 Ile Cys Arg Ile Gly Glu Gly Leu Asp Gln Ala Leu Pro Cys Leu 80 85 90 Thr Glu Leu Ile Leu Thr Asn Asn Ser Leu Val Glu Leu Gly Asp 95 100 105 Leu Asp Pro Leu Ala Ser Leu Lys Ser Leu Thr Tyr Leu Ser Ile 110 115 120 Leu Arg Asn Pro Val Thr Asn Lys Lys His Tyr Arg Leu Tyr Val 125 130 135 Ile Tyr Lys Val Pro Gln Val Arg Val Leu Asp Phe Gln Lys Val 140 145 150 Lys Leu Lys Glu Arg Gln Glu Ala Glu Lys Met Phe Lys Gly Lys 155 160 165 Arg Gly Ala Gln Leu Ala Lys Asp Ile Ala Arg Arg Ser Lys Thr 170 175 180 Phe Asn Pro Gly Ala Gly Leu Pro Thr Asp Lys Lys Arg Gly Gly 185 190 195 Pro Ser Pro Gly Asp Val Glu Ala Ile Lys Asn Ala Ile Ala Asn 200 205 210 Ala Ser Thr Leu Ala Glu Val Glu Arg Leu Lys Gly Leu Leu Gln 215 220 225 Ser Gly Gln Ile Pro Gly Arg Glu Arg Arg Ser Gly Pro Thr Asp 230 235 240 Asp Gly Glu Glu Glu Met Glu Glu Asp Thr Val Thr Asn Gly Ser 245 250 255 

What is claimed is:
 1. An isolated polypeptide selected from the group consisting of: a) a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3, b) a polypeptide comprising a naturally occurring amino acid sequence at least 90% identical to an amino acid sequence selected from the group consisting of SEQ ID NO:1-3, c) a biologically active fragment of a polypeptide having an amino acid sequence selected from the group consisting of SEQ ID NO:1-3, and d) an immunogenic fragment of a polypeptide having an amino acid sequence selected from the group consisting of SEQ ID NO:1-3.
 2. An isolated polypeptide of claim 1 comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3.
 3. An isolated polynucleotide encoding a polypeptide of claim
 1. 4. An isolated polynucleotide encoding a polypeptide of claim
 2. 5. An isolated polynucleotide of claim 4 comprising a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6.
 6. A recombinant polynucleotide comprising a promoter sequence operably linked to a polynucleotide of claim
 3. 7. A cell transformed with a recombinant polynucleotide of claim
 6. 8. A transgenic organism comprising a recombinant polynucleotide of claim
 6. 9. A method of producing a polypeptide of claim 1, the method comprising: a) culturing a cell under conditions suitable for expression of the polypeptide, wherein said cell is transformed with a recombinant polynucleotide, and said recombinant polynucleotide comprises a promoter sequence operably linked to a polynucleotide encoding the polypeptide of claim 1, and b) recovering the polypeptide so expressed.
 10. A method of claim 9, wherein the polypeptide comprises an amino acid sequence selected from the group consisting of SEQ ID NO:1-3.
 11. An isolated antibody which specifically binds to a polypeptide of claim
 1. 12. An isolated polynucleotide selected from the group consisting of: a) a polynucleotide comprising a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, b) a polynucleotide comprising a naturally occurring polynucleotide sequence at least 85% identical to a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, c) a polynucleotide complementary to a polynucleotide of a), d) a polynucleotide complementary to a polynucleotide of b), and e) an RNA equivalent of a)-d).
 13. An isolated polynucleotide comprising at least 60 contiguous nucleotides of a polynucleotide of claim
 12. 14. A method of detecting a target polynucleotide in a sample, said target polynucleotide having a sequence of a polynucleotide of claim 12, the method comprising: a) hybridizing the sample with a probe comprising at least 20 contiguous nucleotides comprising a sequence complementary to said target polynucleotide in the sample, and which probe specifically hybridizes to said target polynucleotide, under conditions whereby a hybridization complex is formed between said probe and said target polynucleotide or fragments thereof, and b) detecting the presence or absence of said hybridization complex, and, optionally, if present, the amount thereof.
 15. A method of claim 14, wherein the probe comprises at least 60 contiguous nucleotides.
 16. A method of detecting a target polynucleotide in a sample, said target polynucleotide having a sequence of a polynucleotide of claim 12, the method comprising: a) amplifying said target polynucleotide or fragment thereof using polymerase chain reaction amplification, and b) detecting the presence or absence of said amplified target polynucleotide or fragment thereof, and, optionally, if present, the amount thereof.
 17. A composition comprising a polypeptide of claim i and a pharmaceutically acceptable excipient.
 18. A composition of claim 17, wherein the polypeptide comprises an amino acid sequence selected from the group consisting of SEQ ID NO:1-3.
 19. A method for treating a disease or condition associated with decreased expression of functional RNABP, comprising administering to a patient in need of such treatment the composition of claim
 17. 20. A method of screening a compound for effectiveness as an agonist of a polypeptide of claim 1, the method comprising: a) exposing a sample comprising a polypeptide of claim 1 to a compound, and b) detecting agonist activity in the sample.
 21. A composition comprising an agonist compound identified by a method of claim 20 and a pharmaceutically acceptable excipient.
 22. A method for treating a disease or condition associated with decreased expression of functional RNABP, comprising administering to a patient in need of such treatment a composition of claim
 21. 23. A method of screening a compound for effectiveness as an antagonist of a polypeptide of claim 1, the method comprising: a) exposing a sample comprising a polypeptide of claim 1 to a compound, and b) detecting antagonist activity in the sample.
 24. A composition comprising an antagonist compound identified by a method of claim 23 and a pharmaceutically acceptable excipient.
 25. A method for treating a disease or condition associated with overexpression of functional RNABP, comprising administering to a patient in need of such treatment a composition of claim
 24. 26. A method of screening for a compound that specifically binds to the polypeptide of claim 1, the method comprising: a) combining the polypeptide of claim 1 with at least one test compound under suitable conditions, and b) detecting binding of the polypeptide of claim 1 to the test compound, thereby identifying a compound that specifically binds to the polypeptide of claim
 1. 27. A method of screening for a compound that modulates the activity of the polypeptide of claim 1, the method comprising: a) combining the polypeptide of claim 1 with at least one test compound under conditions permissive for the activity of the polypeptide of claim 1, b) assessing the activity of the polypeptide of claim 1 in the presence of the test compound, and c) comparing the activity of the polypeptide of claim 1 in the presence of the test compound with the activity of the polypeptide of claim 1 in the absence of the test compound, wherein a change in the activity of the polypeptide of claim 1 in the presence of the test compound is indicative of a compound that modulates the activity of the polypeptide of claim
 1. 28. A method of screening a compound for effectiveness in altering expression of a target polynucleotide, wherein said target polynucleotide comprises a sequence of claim 5, the method comprising: a) exposing a sample comprising the target polynucleotide to a compound, under conditions suitable for the expression of the target polynucleotide, b) detecting altered expression of the target polynucleotide, and c) comparing the expression of the target polynucleotide in the presence of varying amounts of the compound and in the absence of the compound.
 29. A method of assessing toxicity of a test compound, the method comprising: a) treating a biological sample containing nucleic acids with the test compound, b) hybridizing the nucleic acids of the treated biological sample with a probe comprising at least 20 contiguous nucleotides of a polynucleotide of claim 12 under conditions whereby a specific hybridization complex is formed between said probe and a target polynucleotide in the biological sample, said target polynucleotide comprising a polynucleotide sequence of a polynucleotide of claim 12 or fragment thereof, c) quantifying the amount of hybridization complex, and d) comparing the amount of hybridization complex in the treated biological sample with the amount of hybridization complex in an untreated biological sample, wherein a difference in the amount of hybridization complex in the treated biological sample is indicative of toxicity of the test compound.
 30. A method for a diagnostic test for a condition or disease associated with the expression of RNABP in a biological sample, the method comprising: a) combining the biological sample with an antibody of claim 11, under conditions suitable for the antibody to bind the polypeptide and form an antibody:polypeptide complex, and b) detecting the complex, wherein the presence of the complex correlates with the presence of the polypeptide in the biological sample.
 31. The antibody of claim 11, wherein the antibody is: a) a chimeric antibody, b) a single chain antibody, c) a Fab fragment, d) a F(ab′)₂ fragment, or e) a humanized antibody.
 32. A composition comprising an antibody of claim 11 and an acceptable excipient.
 33. A method of diagnosing a condition or disease associated with the expression of RNABP in a subject, comprising administering to said subject an effective amount of the composition of claim
 32. 34. A composition of claim 32, further comprising a label.
 35. A method of diagnosing a condition or disease associated with the expression of RNABP in a subject, comprising administering to said subject an effective amount of the composition of claim
 34. 36. A method of preparing a polyclonal antibody with the specificity of the antibody of claim 11, the method comprising: a) immunizing an animal with a polypeptide consisting of an amino acid sequence selected from the group consisting of SEQ ID NO:1-3, or an immunogenic fragment thereof, under conditions to elicit an antibody response, b) isolating antibodies from the animal, and c) screening the isolated antibodies with the polypeptide, thereby identifying a polyclonal antibody which specifically binds to a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3.
 37. A polyclonal antibody produced by a method of claim
 36. 38. A composition comprising the polyclonal antibody of claim 37 and a suitable carrier.
 39. A method of making a monoclonal antibody with the specificity of the antibody of claim 11, the method comprising: a) immunizing an animal with a polypeptide consisting of an amino acid sequence selected from the group consisting of SEQ ID NO:1-3, or an immunogenic fragment thereof, under conditions to elicit an antibody response, b) isolating antibody producing cells from the animal, c) fusing the antibody producing cells with immortalized cells to form monoclonal antibody-producing hybridoma cells, d) culturing the hybridoma cells, and e) isolating from the culture monoclonal antibody which specifically binds to a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3.
 40. A monoclonal antibody produced by a method of claim
 39. 41. A composition comprising the monoclonal antibody of claim 40 and a suitable carrier.
 42. The antibody of claim 11, wherein the antibody is produced by screening a Fab expression library.
 43. The antibody of claim 11, wherein the antibody is produced by screening a recombinant immunoglobulin library.
 44. A method of detecting a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3 in a sample, the method comprising: a) incubating the antibody of claim 11 with the sample under conditions to allow specific binding of the antibody and the polypeptide, and b) detecting specific binding, wherein specific binding indicates the presence of a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3 in the sample.
 45. A method of purifying a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3 from a sample, the method comprising: a) incubating the antibody of claim 11 with the sample under conditions to allow specific binding of the antibody and the polypeptide, and b) separating the antibody from the sample and obtaining the purified polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO:1-3.
 46. A microarray wherein at least one element of the microarray is a polynucleotide of claim
 13. 47. A method of generating an expression profile of a sample which contains polynucleotides, the method comprising: a) labeling the polynucleotides of the sample, b) contacting the elements of the microarray of claim 46 with the labeled polynucleotides of the sample under conditions suitable for the formation of a hybridization complex, and c) quantifying the expression of the polynucleotides in the sample.
 48. An array comprising different nucleotide molecules affixed in distinct physical locations on a solid substrate, wherein at least one of said nucleotide molecules comprises a first oligonucleotide or polynucleotide sequence specifically hybridizable with at least 30 contiguous nucleotides of a target polynucleotide, and wherein said target polynucleotide is a polynucleotide of claim
 12. 49. An array of claim 48, wherein said first oligonucleotide or polynucleotide sequence is completely complementary to at least 30 contiguous nucleotides of said target polynucleotide.
 50. An array of claim 48, wherein said first oligonucleotide or polynucleotide sequence is completely complementary to at least 60 contiguous nucleotides of said target polynucleotide.
 51. An array of claim 48, wherein said first oligonucleotide or polynucleotide sequence is completely complementary to said target polynucleotide.
 52. An array of claim 48, which is a microarray.
 53. An array of claim 48, further comprising said target polynucleotide hybridized to a nucleotide molecule comprising said first oligonucleotide or polynucleotide sequence.
 54. An array of claim 48, wherein a linker joins at least one of said nucleotide molecules to said solid substrate.
 55. An array of claim 48, wherein each distinct physical location on the substrate contains multiple nucleotide molecules, and the multiple nucleotide molecules at any single distinct physical location have the same sequence, and each distinct physical location on the substrate contains nucleotide molecules having a sequence which differs from the sequence of nucleotide molecules at another distinct physical location on the substrate.
 56. A polypeptide of claim 1, comprising the amino acid sequence of SEQ ID NO:1.
 57. A polypeptide of claim 1, comprising the amino acid sequence of SEQ ID NO:2.
 58. A polypeptide of claim 1, comprising the amino acid sequence of SEQ ID NO:3.
 59. A polynucleotide of claim 12, comprising the polynucleotide sequence of SEQ ID NO:4.
 60. A polynucleotide of claim 12, comprising the polynucleotide sequence of SEQ ID NO:5.
 61. A polynucleotide of claim 12, comprising the polynucleotide sequence of SEQ ID NO:6. 